Python – Convert Float String List to Float Values

Sometimes, while working with Python Data, we can have a problem in which we need to perform conversion of Float Strings to float values. This kind of problem is quite common in all domains and find application quite often. Let’s discuss certain ways in which this task can be performed.

Input : test_list = [‘8.6’, ‘4.6’]
Output : [8.6, 4.6]

Input : test_list = [‘4.5’]
Output : [4.5]

Method #1 : Using list comprehension + float()
The combination of above functions can be used to solve this problem. In this, we perform task of conversion using float() and list comprehension is used to perform iteration.

# Python3 code to demonstrate working of
# Convert Float String List to Float Values
# Using float() + list comprehension

# initializing list
test_list = ['87.6', '454.6', '9.34', '23', '12.3']

# printing original list
print("The original list : " + str(test_list))

# Convert Float String List to Float Values
# Using float() + list comprehension
res = [float(ele) for ele in test_list]

# printing result
print("List after conversion : " + str(res))

Output :

The original list : ['87.6', '454.6', '9.34', '23', '12.3']
List after conversion : [87.6, 454.6, 9.34, 23.0, 12.3]

Method #2 : Using map() + float()
The combination of above functions can also be used to solve this problem. In this, we perform the task of conversion using float and extension of conversion logic using map().

# Python3 code to demonstrate working of
# Convert Float String List to Float Values
# Using map() + float()

# initializing list
test_list = ['87.6', '454.6', '9.34', '23', '12.3']

# printing original list
print("The original list : " + str(test_list))

# Convert Float String List to Float Values
# Using map() + float()
res = list(map(float, test_list))

# printing result
print("List after conversion : " + str(res))

Output :

The original list : ['87.6', '454.6', '9.34', '23', '12.3']
List after conversion : [87.6, 454.6, 9.34, 23.0, 12.3]