It is the process of python built-in string methods and formatting operations. In python, the string can be defined between the single and double quotations.
x = 'string here 1'
y = "string here 1"
x == y
it gives "true" as an output.
String Manipulation in Python
In python string handle through many ways like:
upper() - Used to change a string into the uppercase letter
lower() - Used to change a string into the lowercase letter
capitalize() - show string with the first letter as a capital
title() - It works as a capitalize()
swapcase() - every string word look as first and the last word is capital
Let we will learn these string manipulation functions using python which is given below:
Adding and removing spaces - Formatting of string
In the python strip() method used to remove space, it strips whitespace from the beginning and end of the line.
Let suppose string is -
>>> string = " Welcome to the Codersarts "
>>> string.strip()
Output result shows without any space in string.
Another way to remove space from left and right side of the string is like -
rstrip() or - remove space from the right side of a string
lstrip() - remove space from the left side of the string
There are many other formattings of strings
center() - Center the string within given space
ljust() and - will left-justify the string within spaces of a given length.
rjust() - right-justify the string within spaces of a given length
zfill() - which is a special method to right-pad a string with zeros.
Finding and replacing substrings
This is the main common feature that is used to find and replacing substrings from a string in python.
find()/rfind(),
index()/rindex(), and
replace()
These built-in methods are the best for finding and replacing substrings.
Now we discuss rfind() and rindex() methods- These work same as above but searching from the end, not beginning and
rindex()
rfind()
startswith() and methods endswith() - These used in python for the special case of checking for a substring at the beginning or end of a string.
replace() - Use to replace a given substring with a new string.
Splitting and partitioning strings
If you want to find substring and then split the string based on its location,
the partitions() and/or
split() methods used.
The split() method is more useful. The default is to split on any whitespace, returning a list of the individual words in a string:
For Ex -
line = "This is codersarts blog"
line.split()
It output shows as:
['This', 'is', 'codersarts', 'blog']
Another related method is splitlines(), which splits on newline characters.
>>> string = """this
>>> is codersarts
>>> blog"""
string.splitlines()
The outcome is like that - ['this', 'is codersarts', 'blog']
Format Strings
Used to manipulate strings into desired formats.
string representations can always be found using the str() function.
let we learn it as -
>>> number= 2.458
>>> str(number)
The outcome is like that - '2.458', it is an string formate of number 2.458
A more flexible way to do this is to use format strings, which are strings with special markers (noted by curly braces)
Let we check this:
>>> print("The value of number is {}".format(number))
Output:
'The value of the number is 2.458'
Another more examples to formatting string are like this:
>>> print("My name is: {0}. and village is: {1}.".format('Naveen kumar', 'Etah'))
'My name is: Naveen kumar. and village is: Etah.'
>>> print("First letter: {first}. Last letter: {last}.".format(last='N', first='R'))
'First letter: N. Last letter: R.'
Apply on digit:
>>> number = 3.142
>>> print("number= {0:.2f}".format(number))
'number= 3.14'
In this blog, we will cover the most useful string manipulation methods which are used in python to manipulate the string. It makes easy to perform the operation on strings.
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