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 ā%sā 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() functionĀ
Syntax: str(integer_value)
Example:Ā Ā
Python3
num = 10Ā
# checkĀ and print type of num variableprint("Type of variable before conversion : ", type(num))Ā
# convert the num into stringconverted_num = str(num)Ā
# checkĀ and print type converted_num variableprint("Type After conversion : ",type(converted_num)) |
Output:
Type of variable before conversion : <class 'int'> Type After conversion : <class 'str'>
2. Using ā%sā keyword
Syntax: ā%sā % integer
Example:Ā
Python3
num = 10Ā
# checkĀ and print type of num variableprint("Type of variable before conversion : ", type(num))Ā
# convert the num into string and printconverted_num = "% s" % numprint("Type after conversion : ", type(converted_num)) |
Output:
Type of variable before conversion : <class 'int'> Type after conversion : <class 'str'>
3. Using .format() function
Syntax: ā{}ā.format(integer)
Example:Ā
Python3
num = 10Ā
# checkĀ and print type of num variableprint("Type before conversion : ", type(num))Ā
# convert the num into string and printconverted_num = "{}".format(num)print("Type after conversion :",type(converted_num)) |
Output:
Type before conversion : <class 'int'> Type after conversion : <class 'str'>
4. Using f-string
Syntax: f'{integer}ā
Example:Ā
Python3
num = 10Ā
# checkĀ and print type of num variableprint("Type before conversion : ",type(num))Ā
# convert the num into stringconverted_num = f'{num}'Ā
# print type of converted_numprint("Type after conversion : ", type(converted_num)) |
Output:
Type before conversion : <class 'int'> Type after conversion : <class 'str'>
Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 5. Using __str__() methodĀ
Syntax: Ā Integer.__str__()
Python3
num = 10Ā
# checkĀ and print type of num variableprint("Type before conversion : ",type(num))Ā
# convert the num into stringconverted_num = num.__str__()Ā
# print type of converted_numprint("Type after conversion : ", type(converted_num)) |
Output:
Type before conversion : <class 'int'> Type after conversion : <class 'str'>
Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 6. Using str.isdigit()Ā
Python3
str_value = "1234"if str_value.isdigit():Ā Ā Ā Ā int_value = int(str_value)Ā Ā Ā Ā print(int_value)Ā Ā Ā Ā print(type(int_value))else:Ā Ā Ā Ā raise ValueError("Invalid literal for int(): {}".format(str_value)) |
1234 <class 'int'>
7.Using join() method:
Ā 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 = 10Ā
# checkĀ and print type of num variableprint("Type before conversion : ",type(num))Ā
# convert the num into stringconverted_num = ''.join(list(str(num)))Ā
# print type of converted_numprint("Type after conversion : ", type(converted_num)) |
Type before conversion : <class 'int'> Type after conversion : <class 'str'>
Time Complexity: O(N) where n is the number of digits in the integer.Ā
Space Complexity:O(N) as we need to create a list of characters that has n elements,
