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Convert String to Double in Python3

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  • Last Updated : 08 Oct, 2021
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Given a string and our task is to convert it in double. Since double datatype allows a number to have non -integer values. So conversion of string to  double is the same as the conversion of string to float 

This can be implemented in these two ways

1) Using float() method

Python3




str1 = "9.02"
print("This is the initial string: " + str1)
 
# Converting to double
str2 = float(str1)
print("The conversion of string to double is", str2)
 
str2 = str2+1
print("The converted string to double is incremented by 1:", str2)


Output:

This is the initial string: 9.02
The conversion of string to double is 9.02
The converted string to double is incremented by 1: 10.02

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

Python3




from decimal import Decimal
 
 
str1 = "9.02"
print("This is the initial string: " + str1)
 
# Converting to double
str2 = Decimal(str1)
print("The conversion of string to double is", str2)
 
str2 = str2+1
print("The converted string to double is incremented by 1:", str2)


Output:

This is the initial string: 9.02
The conversion of string to double is 9.02
The converted string to double is incremented by 1: 10.02
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