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Python - convert string to float
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In this article, we would like to show you how to convert string to float in Python.
Quick solution:
number = "1.234"
result = float(number)
print(type(result)) # <class 'float'>
1. Practical example using float()
In this example, we simply use float() to convert the string to the float number.
number = "1.1111111111111111"
result = float(number)
print(result) # 1.1111111111111112
print(type(result)) # <class 'float'>
Output:
1.1111111111111112
<class 'float'>
Note:
When you have more than 15 decimal places, the
float()will round the number. If you don't want your number to be rounded, you can use alternative solution from the section below.
2. Alternative solution
In this example, we use decimal.Decimal() to a float number. This solution doesn't round the number with more than 15 decimal places like float().
from decimal import Decimal
number = "1.1111111111111111"
result = Decimal(number)
print(result) # 1.1111111111111111
print(type(result)) # <class 'decimal.Decimal'>
Output:
1.1111111111111111
<class 'decimal.Decimal'>