Convert string to int or float Python | string to number

Convert string to int Python is different from other programming languages like Java, c and etc. Python doesn’t implicitly typecast strings to Integer(numbers).

Python has standard built-in int()and functionfloat( ) is to convert a string into an integer or float value. Call it with a string containing a number as the argument, and it returns the number converted to an integer:

Convert string to int Python Example 

Use Python standard built-in function int() convert string to an integer.

age = "21"
print(type(age))
age_number = int(age)
print(type(age_number))

Output: <class ‘str’>
<class ‘int’>

string to float Example 

Same as int() function, use Python standard built-in function int() convert string to float.

age = "21"
print(type(age))
age_number = float(age)
print(type(age_number))

Output: <class ‘str’>
<class ‘float’>

QA: What if string content converts into an integer?

It will throw an error. Let’s check the example, for the same. Only change digit to the word in age variables.

age = "one"
print(type(age))
age_number = float(age)
print(type(age_number))

Output: <class ‘str’>

.....

ValueError: could not convert string to float: 'one'

For more information Official documentation for int() – https://docs.python.org/3.6/library/functions.html#int

Note : This example (Project) is developed in PyCharm 2018.2 (Community Edition)
JRE: 1.8.0
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.13.6

Python 3.7

All Examples of Convert string to int are in Python 3, so it may change its different from python 2 or upgraded versions.