Strings in Python | Codingal (2022)

Table of Contents

Introduction String literal Creating python strings Accessing the characters Slicing the part of string Manipulating strings and deleting Updating element of string Deleting element of string Updating entire string Conclusion

What are Strings in Python?

Python string is a data type in which the programming language stores any data in a computer. Python string is an array of bytes.

A string is a sequence of characters. It is among the most popular data types in Python. It can be created simply by enclosing characters in quotes. Strings can be created by enclosing characters inside a single quote or double quotes.

In this blog, we will try to understand how to create, update and delete the python strings. At the same time, we will also look at different operators that can be used in python strings and how escape characters make the task of specifying the strings easier.

Introduction

Python string is considered an array consisting of bytes containing Unicode characters. The Character data type is not present in Python.

String is one of the primitive data structures and is the building block for data manipulation. It can be accessed from both directions: forward and backward.

String literal

A string literal is a sequence of characters forming a string. Valid syntax of string literals can be any text enclosed in single quotes, double quotes, triple quotes or triple double quotes (“““sample string”””). A multiline string should always be wrapped with triple single quotes or triple double quotes

Creating Python strings

As mentioned above, strings can be created using single, double and triple quotes. Let’s consider a small program demonstrating the creation of python string –

SampleString = 'Let us fall in love with python'print("Python string enclosed between single quotes - ")print(SampleString)SampleString = "Python string is an array of bytes"print("\nPython string enclosed between double quotes - ")print(SampleString)SampleString = '''Python for kids can improve the logical and creative skills'''print("\nPython string enclosed between triple quotes - ")print(SampleString)SampleString = '''Codingalat theheart'''print("\nMultiline string creation in python - ")print(SampleString)

The output of above-mentioned code snippet is as shown below –

Python string enclosed between single quotes
Let us fall in love with python

(Video) How to Use Strings in Python - Python Tutorial for Beginners

Python string enclosed between double quotes
Python string is an array of bytes

Python string enclosed between triple quotes
Python for kids canimprove the logical and creative skills

Multiline string creation in python
Codingal
at the
heart

Accessing the characters

We can use square brackets and indexing to access the elements of the string. An index is an integer number and always starts with 0 for the first character. Python also supports negative indexing where the last element has -1 index, the second last element -2 index and so on.

Strings in Python | Codingal (1)

There are primarily two types of errors that can be generated while accessing python strings incorrectly. In case, if we specify an index of any other datatype than integer, then it results to TypeError. The second case involves accessing the element that is not within the index range for a particular string, which results in IndexError.
Below is a sample program for demonstration of string element accessing in python –

# Program for accessing Python stringsPythonString = "Codingal"print("Printing the complete string - ")print(PythonString)# Accessing first characterprint("\nAccessing the first character of string - ")print(PythonString[0])# Accessing third characterprint("\nAccessing the third character of string - ")print(PythonString[2])# Accessing third character using negative indexingprint("\nAccessing the third character of string - ")print(PythonString[-1])

Execution of above program results to following output –

Priniting the complete string -
Codingal

Accessing the first character of string -
C

Accessing the third character of string -
d

Accessing the third character of string -
l

Slicing the part of string

We can access a specific part of the python string with the help of the string slicing and the operator of slicing, which is a colon (:). Moreover, we can specify one or two numbers specifying the range of characters we have to slice.
So let us have a small program demonstrating how to use slicing to access part of the string containing characters within a specific range.

(Video) Python Tutorial for Beginners 2: Strings - Working with Textual Data

# Program for accessing part of Python string using slicing# Creating a StringPythonString = "Codingal"print("Python string in the beginning - ")print(PythonString)# Retrieving the part of string containing# characters within range of 2-6print("\nGetting string slice of range 2 to 6 - ")print(PythonString[2:6])# Retrieving the part of string containing# characters within range of third character# to third last characterprint("\nGetting string slice of range 2 to -3 - ")print(PythonString[2:-3])

The output of the above code snippet is as shown below –

Python string in the beginning -
Codingal

Getting string slice of range 2 to 6 -
ding

Getting string slice of range 2 to -3 -
din

Manipulating strings and deleting
Previously, manipulation containing either updating the existing string characters or deletion of the characters in string is not permissible in python strings. As string is immutable we cannot reassign the elements of string or even delete elements. However, now it is supported.

Updating element of string
Let us have a glance at how to update individual elements of the string with a small demonstration program –

# Program trying to update individual elements of string# Due to immutable property of string it was not permissible previously.PythonString = "Welcome to Codingal"print("String in the beginning - ")print(PythonString)# First methodology to update string elementsPythonList = list(PythonString)PythonList[2] = 'k'UpdatedPythonString = ''.join(PythonList)print("\nUpdated python string after modifying third character element - ")print(UpdatedPythonString)# First methodology to update string elementsUpdatedString = PythonString[0:2] + 'k' + PythonString[3:]print(UpdatedString)

Execution of above program results to following output –

String in the beginnning -
Welcome to Codingal

Updated python string after modifying third character element -
Wekcome to Codingal
Wekcome to Codingal

Deleting element of string

Let us now consider a sample program for deleting elements of string –

# Program trying to delete element of python stringPythonString = "Welcome to Codingal"print("String in the beginning - ")print(PythonString)# Element deletion from original stringUpdatedPythonString = PythonString[0:2] + PythonString[3:]print("\nResulting python string after removing the second element from it - ")print(UpdatedPythonString)

The output of above code is –

String in the beginning -
Welcome to Codingal

(Video) Python Strings || Python Tutorial || Python Programming

Resulting python string after removing the second element from it -
Wecome to Codingal

Updating entire string

We can also go for reassigning a completely new string to the same name and accessing the updated string.
Here’s a program demonstrating updating an entire string –

# Program trying to update entire python stringPythonString = "Welcome to Codingal"print("String in the beginning - ")print(PythonString)# Updating a StringPythonString = "Let's fall in love with Coding"print("\nString after updation - ")print(PythonString)

After execution the output of above code is as following –

String in the beginning -
Welcome to Codingal

String after updation -
Let’s fall in love with Coding

Deleting entire string in python –

There is a functionality where we can go for deleting the whole string by using the inbuilt function present in python named del keyword.# Program trying to delete python stringPythonString = "Welcome to codingal"print("String in the beginning - ")print(PythonString)del PythonStringprint("\nThe deleted python string - ")print(PythonString)

The output of above code is as shown below and showing error as the deleted string cannot be accessed and printed –

String in the beginning -
Welcome to Codingal

The deleted python string -
Traceback (most recent call last):
File "main.py", line 11, in <module>
print(PythonString)
NameError: name 'PythonString' is not defined

Escape sequences
When we have to keep a single or double quote present inside the string, creating a python string gives a syntax error if the string containing quotes is enclosed between single or double quotes.
To avoid this, we can either use triple quotes to enclose the string containing single or double quotes in it or use escape sequences.
In python, multiple escape sequence characters are supported and all of them begin with a backslash and hold different interpretations.
To allow the occurrence of quotes and slashes, they are preceded with backslash as their presence is then considered even if a string is enclosed between single or double quotes.
Let us look at the practical usage of escape sequences in python with the help of a program-

# Program for demonstrating use of escape sequences in python strings# Initial StringPythonString = '''Let's fall in love with "Coding"'''print("Python string enclosed in triple quotes - ")print(PythonString)# escape sequencing used to allow single quote presencePythonString = 'Let\'s fall in love with "Coding"'print("\nUsing slash to allow use of single quotes in python string")print(PythonString)# escape sequencing used to allow double quote presencePythonString = "Get ready to fall in love with \"Coding\""print("\nEscape sequence used to allow double quote - ")print(PythonString)# Using escape sequence character to print the# path or address using backslash escape characterPythonString = "D:\\Desktop\\Codingal"print("\nUsing backslash escape character to print path - ")print(PythonString)# using tabPythonString = "welcome\to codingal"print("\nUse of tab escape sequence - ")print(PythonString)# Using new linesPythonString = "Welcome\nLets get ready to love coding!"print("\nUse of tab escape sequence - ")print(PythonString)

The output of above code is –

Python string enclosed in triple quotes

(Video) 31 ESSENTIAL Python String Methods

Let's fall in love with "Coding"

Using slash to allow use of single quotes in python string

Let's fall in love with "Coding"

Escape sequence used to allow double quote

Get ready to fall in love with "Coding"

Using backslash escape character to print path

D: \Desktop\Codingal
Use of tab escape sequence

welcome to codingal

Use of tab escape sequence

Welcome

Lets get ready to love coding!

Conclusion
After reading this blog, you will get a clear understanding of how to use python strings, its creation, updating and deleting the part of string and whole python strings, operators on strings and escape sequence characters used in strings. You also became familiar with some of the popular string operator.

Python is one of the popular and versatile programming languages. It is the best programming language to start with. Coding for kids has many beneficial advantages that develop cognitive abilities as well as enhances communication skills, entrepreneurship skills, and stimulates creativity.

Python is widely used in various fields such as data analysis, machine learning, software testing and prototyping, web development, and in many other areas.

Codingal offers Python for kids course to help your child enhance cognitive, logical, and computational skills. We provide 1:1 live interactive online coding classes for kids with expert coding instructors. Along with lifetime access to course content and downloadable learning resources, to cater to every child’s need by providing a personalized journey. Try a free class today!

FAQs

How do I fix not enough arguments for format string? ›

To solve this problem, first ensure you enclose all arguments in curly brackets () if you are using the % operator. You can use the . format() method as a replacement for the % syntax if you want to fix this error and modernize your code.

Do Python strings have a limit? ›

Python strings are length-prefixed, so their length is limited by the size of the integer holding their length and the amount of memory available on your system.

What does %s %s mean in Python? ›

%s specifically is used to perform concatenation of strings together. It allows us to format a value inside a string. It is used to incorporate another string within a string. It automatically provides type conversion from value to string.

What is %s %d Python? ›

%s is used as a placeholder for string values you want to inject into a formatted string. %d is used as a placeholder for numeric or decimal values.

How do you pass string arguments? ›

In C, if you need to amend a string in a called function, pass a pointer to the first char in the string as an argument to the function. If you have allocated storage for the string outside the function, which you cannot exceed within the function, it's probably a good idea to pass in the size.

Can you format strings in Python? ›

There are several ways to format output. To use formatted string literals, begin a string with f or F before the opening quotation mark or triple quotation mark. Inside this string, you can write a Python expression between { and } characters that can refer to variables or literal values.

What is the biggest limitation of Python? ›

After the high memory usage, it's lack of speed is one of the biggest disadvantages of Python. As it executes the code one line at a time, the speed of execution often is hampered. Where speed is important for the project, Python cannot be used for coding.

Is there a limit to query string? ›

Although officially there is no limit specified by RFC 2616, many security protocols and recommendations state that maxQueryStrings on a server should be set to a maximum character limit of 1024. While the entire URL, including the querystring, should be set to a max of 2048 characters.

What is the limit of string? ›

While an individual quoted string cannot be longer than 2048 bytes, a string literal of roughly 65535 bytes can be constructed by concatenating strings.

What does %C do in Python? ›

%c represents character values. It's part of the integer representation types. You can't enter a value larger than an unsigned byte (255) as a positional argument to it, so be careful where and when you elect to use it.

What is \n used for in Python? ›

🔹 In Summary

The new line character in Python is \n . It is used to indicate the end of a line of text.

How do you use .2f in Python? ›

2f is a placeholder for floating point number. So %d is replaced by the first value of the tuple i.e 12 and %. 2f is replaced by second value i.e 150.87612 .
...
Python String Formatting.
Format codesDescription
ffor floating point numbers
bfor binary numbers
ofor octal numbers
xfor octal hexadecimal numbers
3 more rows

What is def __ str __ in Python? ›

Python __str__()

This method returns the string representation of the object. This method is called when print() or str() function is invoked on an object.

What is %R and %S in Python? ›

The %s specifier converts the object using str(), and %r converts it using repr().

What is %d %s in C? ›

%s is for string %d is for decimal (or int) %c is for character.

What does strings [] args mean? ›

string args[] in java is an array of type java. lang. String class that stores java command line arguments. Variable argument or varargs in Java allows us to write more flexible methods which can accept as many arguments as we need.

Can strings be arguments? ›

Several of the editor commands require arguments called string arguments. A string argument is either matched against strings or replaces a string in the text. A string argument may or may not begin with a delimiter character (usually a slash (/) unless changed by the DELIM command).

Is %s string in Python? ›

The %s operator lets you add a value into a Python string. The %s signifies that you want to add a string value into a string. The % operator can be used with other configurations, such as %d, to format different types of values.

What does .2f mean in Python? ›

A format of . 2f (note the f ) means to display the number with two digits after the decimal point. So the number 1 would display as 1.00 and the number 1.5555 would display as 1.56 .

Can you use {} in Python? ›

In languages like C curly braces ( {} ) are used to create program blocks used in flow control. In Python, curly braces are used to define a data structure called a dictionary (a key/value mapping), while white space indentation is used to define program blocks.

What was Python weakness? ›

Simplicity: Python is a simple programming language which is also the biggest disadvantage. It can indeed be a problem. Its syntax is very simple which makes a programmer more of python person and because of which they might feel code of harder language like Java unnecessary.

Is Python the most powerful language? ›

Python is an easy to learn, powerful programming language. Python is the most powerful language you can still read. All in all, I think there are three main reasons why Python is popular: It is an easy programming language to learn, with straightforward syntax.

Will Python ever go away? ›

Python has become the world's fastest-growing programming language, and Stackoverflow predicted in 2017 that it would surpass all the other programming languages. Python will not disappear any sooner than a few of them have expected.

Can a query string be too long? ›

The request filtering module is configured to deny a request where the query string is too long. These errors are due to long query string. By default the maximum query string length(maxQueryString) accepted by IIS is 2048. IIS throws this error for any query string in the URL exceeding this limit.

How long can a string be in a database? ›

The maximum length of an SQL statement string is 65,000 characters.

Can a query string have multiple question marks? ›

A question mark is not a part of the query string, but it's used to establish boundaries and is considered a separator. Another question mark, however, will be just a literal question mark. Although having a second question mark is not invalid, it may be because of an unknown issue.

How long is a string? ›

(colloquial, often humorous, rhetorical question) Used as a response to a question such as "How long will it take?" or "How big is it?" when the length or size is unknown, infinite, variable, or relative.

How large is a string in bytes? ›

But what about a string? A string is composed of: An 8-byte object header (4-byte SyncBlock and a 4-byte type descriptor)

How many numbers can a string hold? ›

Each code point, or character code, represents a single Unicode character. A string can contain from 0 to approximately two billion (2 ^ 31) Unicode characters.

Is Python harder than C? ›

Ease of development – Python has fewer keywords and more free English language syntax whereas C is more difficult to write. Hence, if you want an easy development process go for Python. Performance – Python is slower than C as it takes significant CPU time for interpretation. So, speed-wise C is a better option.

Is Python as fast as C? ›

It is 450 million loops in a second, which is 45 times faster than Python. Furthermore, C can be compiled in optimized mode for a better performance.

Should I learn C or Python? ›

C is a great way to learn how computers actually work in terms of memory management, and is useful in high-performance computing. C++ is great for game development. Python is awesome for science and statistics. Java is important if you want to work at large tech companies.

What does N 2 == 0 mean in Python? ›

This is a condition to check if a number n is odd or even. n % 2 -> gives the remainder when n is divided by 2. so n % 2 == 0 means , if remainder is zero then number is even else number is odd.

What is N += 1 in Python? ›

Python does not have unary increment/decrement operator( ++/--). Instead to increament a value, use a += 1. to decrement a value, use− a -= 1.

What does F mean in Python? ›

The release of Python version 3.6 introduced formatted string literals, simply called “f-strings.” They are called f-strings because you need to prefix a string with the letter 'f' to create an f- string. The letter 'f' also indicates that these strings are used for formatting.

What does %s mean in coding? ›

The %s means, "insert the first argument, a string, right here." The %d indicates that the second argument (an integer) should be placed there. There are different %-codes for different variable types, as well as options to limit the length of the variables and whatnot. Control Character.

What is double == in Python? ›

Python provides two very similar equality operators used for comparisons: The double equals ( == ), also known as the equality operator. The is keyword, also known as the identity operator.

What does 6d mean in Python? ›

%6d. The width (here 6) specifies the minimum number of characters to be printed. If the value to be printed is shorter than this number, the result is padded with blank spaces. The value is not truncated even if the result is larger. Example: printf("%.6d\n%6d",1,1);

What does _ and __ mean in Python? ›

The use of double underscore ( __ ) in front of a name (specifically a method name) is not a convention; it has a specific meaning to the interpreter. Python mangles these names and it is used to avoid name clashes with names defined by subclasses.

What is __ str __( self? ›

__str__ is a special method, like __init__ , that is supposed to return a string representation of an object. For example, here is a str method for Time objects: # inside class Time: def __str__(self): return '%.2d:%.2d:%.2d' % (self.hour, self.minute, self.second)

What is __ init __ called? ›

__init__ method

It is called as a constructor in object oriented terminology. This method is called when an object is created from a class and it allows the class to initialize the attributes of the class.

Is Python harder than R? ›

R can be challenging for beginners to learn due to its nonstandardized code. Python is usually easier for most learners and has a smoother linear curve. In addition, Python requires less coding time since it's easier to maintain and has a syntax similar to the English language.

What is \r in Python example? ›

R Means 'Raw String'

Normally, Python uses backslashes as escape characters. Prefacing the string definition with 'r' is a useful way to define a string where you need the backslash to be an actual backslash and not part of an escape code that means something else in the string.

What can I use instead of %s in Python? ›

Use the %r for debugging, since it displays the "raw" data of the variable, but the others are used for displaying to users.

What does %f mean coding? ›

%f. a floating point number for floats. %u. int unsigned decimal.

Why do we use header files in C? ›

C language has numerous libraries that include predefined functions to make programming easier. In C language, header files contain the set of predefined standard library functions. You request to use a header file in your program by including it with the C preprocessing directive “#include”.

What is a float C? ›

Float is a datatype which is used to represent the floating point numbers. It is a 32-bit IEEE 754 single precision floating point number ( 1-bit for the sign, 8-bit for exponent, 23*-bit for the value. It has 6 decimal digits of precision.

How do you fix too many arguments in a function? ›

Solution. So to fix the error “You've entered too many arguments for this function” you need to go through the content of the cell, character-by-character, to ensure that there are no syntax errors. In other words, you need to check whether all opened brackets are closed and all commas are properly in place.

What causes format string vulnerability? ›

The Format String exploit occurs when the submitted data of an input string is evaluated as a command by the application.

How many arguments can be passed to format () in Python? ›

This means we can pass only one value into the str. format() method, which after getting formatted, takes the placeholder's position inside the string.

What does not all arguments converted during string formatting mean? ›

Such a common error is TypeError: not all arguments converted during string formatting. This error is caused when there is a mismatch in data types and strings are not properly formatted. The solution to this error is to use proper string formatting functions such as int() or str() to obtain the desired data type.

Can Python take unlimited arguments? ›

Python lets us define a function that handles an unknown and unlimited number of argument values. Examples of built-in functions with a unlimited number of argument values are max and min .

How do you stop massive arguments? ›

Here are four simple statements you can use that will stop an argument 99 percent of the time.
  1. “Let me think about that.” This works in part because it buys time. ...
  2. “You may be right.” This works because it shows willingness to compromise. ...
  3. “I understand.” These are powerful words. ...
  4. “I'm sorry.”

How do you reduce the number of arguments in a function? ›

You can reduce the number of function calls and arguments by:
  1. Inlining function calls.
  2. Using static class members or global variables.
  3. Passing arguments in registers.
  4. Using prototypes to minimize function call processing.

What is a string error? ›

String termination errors occur when: Data enters a program via a function that does not null terminate its output. The data is passed to a function that requires its input to be null terminated.

Is string format safe? ›

Many programming languages use what is called format strings to insert values into a string of text. But unless they are set up properly on the server-side, format strings can be exploited to execute arbitrary code, perform buffer overflow attacks, and extract sensitive information from the web server/application.

Why do we use string format? ›

In java, String format() method returns a formatted string using the given locale, specified format string, and arguments. We can concatenate the strings using this method and at the same time, we can format the output concatenated string.

What is the difference between string and argument? ›

A string is anything with quote marks around it, for example 'this is a string' . An argument is something that is 'passed' to a function (it's inside the parentheses of a function), for example in drawBox(red) , red is the argument.

What would happen if string [] args is not included? ›

What happens if the main() method is written without String args[]? The program will compile, but not run, because JVM will not recognize the main() method. Remember JVM always looks for the main() method with a string type array as a parameter.

Does format return a string? ›

format() method returns the formatted string by a given locale, format, and argument.

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