How to convert String to Int in Python

Convert a string to integer or float

You can use the ‘int()‘ function to convert a string to an integer in Python.

Example:

string = "123"
number = int(string)
print(number)

Output:

123

If the string cannot be converted to an integer, a ‘ValueError‘ will be raised.

You can also use other function such as ‘float()‘ if you want to convert string to float.

string = "123.45"
number = float(string)
print(number)

Output:

123.45

Note: The input string should only contain numeric characters and an optional leading ‘+‘ or ‘-‘ sign otherwise it will raise a ‘ValueError‘.

Convert Integer to String

You can use the ‘str()‘ function to convert an integer to a string in Python.

Example:

number = 123
string = str(number)
print(string)

Output:

123

You can also use the ‘format()‘ method or the f-strings (formatted string literals) introduced in Python 3.6 for more flexibility and readability when formatting numbers as strings.

Example:

x = 123
print("The number is: {}".format(x))

or

x = 123
print(f"The number is: {x}")

Both will give output:

The number is "123"

Note that the ‘str()‘ function returns a human-readable string representation of the number, while ‘format()‘ and f-strings provide a way to format the string representation with more control over the output.