In Python programming, you will frequently run into situations in which data must be converted from one type to another. For instance, you might have a string that contains a number, and you need to convert it to a float to do the math on it. You can use python type casting function float() to convert string to float in python.

Example 1:

str = '3942.54'
flt = float(str)

print("Type of orignal string: " , type(str))
print("Type of converted string: ", type(flt))

Output:

Type of orignal string:  <class 'str'>
Type of converted string:  <class 'float'>

Example 2:

str_1 = '345.23'
str_2 = '453.67'

# Type Casting

flt_1 = float(str_1)
flt_2 = float(str_2)

# Addition of Numbers

add_str = flt_1 + flt_2
print("Addition of Numbers: ", add_str)

Output:

Addition of Numbers:  798.9000000000001

References:

https://docs.python.org/3/