Convert Python String to Float datatype

Let us see how to convert a string object into a float object. We can do this by using these functions :

• float()
• decimal()

Method 1: Using float()

python3

# declaring a string
str1 = "9.02"
print("The initial string : " + str1)
print(type(str1)) 

# converting into float
str2 = float(str1)
print("\nThe conversion of string to float is ", str2)
print(type(str2)) 

# performing an operation on the float variable
str2 = str2 + 1
print("The converted string to float is incremented by 1 : ", str2)

Output :

The initial string : 9.02
<type 'str'>

The conversion of string to float is  9.02
<type 'float'>
The converted string to float is incremented by 1 :  10.02

Method 2: Using decimal() : Since we only want a string with a number with decimal values this method can also be used.

python3

# importing the module
from decimal import Decimal

# declaring a string
str1 = "9.02"
print("The initial string : " + str1)
print(type(str1)) 

# converting into float
str2 = Decimal(str1)
print("\nThe conversion of string to float is ", str2)
print(type(str2)) 

# performing an operation on the float variable
str2 = str2 + 1
print("The converted string to float is incremented by 1 : ", str2)

Output :

The initial string : 9.02
<type 'str'>

The conversion of string to float is  9.02
<type 'float'>
The converted string to float is incremented by 1 :  10.02

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