Convert integer to string in Python
In Python an integer can be converted into a string using the built-in str() function. The str() function takes in any python data type and converts it into a string. But use of the str() is not the only way to do so. This type of conversion can also be done using the “%s” keyword, the .format function or using f-string function.
Below is the list of possible ways to convert an integer to string in python:
1. Using str() function
Syntax: str(integer_value)
Example:
Python3
num = 10
print ( "Type of variable before conversion : " , type (num))
converted_num = str (num)
print ( "Type After conversion : " , type (converted_num))
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Output:
Type of variable before conversion : <class 'int'>
Type After conversion : <class 'str'>
2. Using “%s” keyword
Syntax: “%s” % integer
Example:
Python3
num = 10
print ( "Type of variable before conversion : " , type (num))
converted_num = "% s" % num
print ( "Type after conversion : " , type (converted_num))
|
Output:
Type of variable before conversion : <class 'int'>
Type after conversion : <class 'str'>
3. Using .format() function
Syntax: ‘{}’.format(integer)
Example:
Python3
num = 10
print ( "Type before conversion : " , type (num))
converted_num = "{}" . format (num)
print ( "Type after conversion :" , type (converted_num))
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Output:
Type before conversion : <class 'int'>
Type after conversion : <class 'str'>
4. Using f-string
Syntax: f'{integer}’
Example:
Python3
num = 10
print ( "Type before conversion : " , type (num))
converted_num = f '{num}'
print ( "Type after conversion : " , type (converted_num))
|
Output:
Type before conversion : <class 'int'>
Type after conversion : <class 'str'>
5. Using __str__() method
Syntax: Integer.__str__()
Python3
num = 10
print ( "Type before conversion : " , type (num))
converted_num = num.__str__()
print ( "Type after conversion : " , type (converted_num))
|
Output:
Type before conversion : <class 'int'>
Type after conversion : <class 'str'>
6. Using str.isdigit()
Python3
str_value = "1234"
if str_value.isdigit():
int_value = int (str_value)
print (int_value)
print ( type (int_value))
else :
raise ValueError( "Invalid literal for int(): {}" . format (str_value))
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Output
1234
<class 'int'>
7.Using join() method:
join() method is used to convert a list of integers to a string. We convert the integer to a list of characters using the list() function and then join them using the join() method.
Python3
num = 10
print ( "Type before conversion : " , type (num))
converted_num = ''.join( list ( str (num)))
print ( "Type after conversion : " , type (converted_num))
|
Output
Type before conversion : <class 'int'>
Type after conversion : <class 'str'>
Time Complexity: O(N) where n is the number of digits in the integer.
Space Complexity:O(N) as we need to create a list of characters that has n elements,
Last Updated :
07 Mar, 2023
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