Convert String float to float list in Python

Sometimes, while working with data, we could be dealing with numbers, that are in decimal and not integers. This is general case in data science domain. Let’s discuss how to resolve a problem in which we may have a comma separated float numbers and we need to convert to float list.

Method #1 : Using list comprehension + split() + float()
The combination of the above methods can be used to perform this task. In this, we convert the String to string list using split and then convert the string to float using float().

Python3

# Python3 code to demonstrate working of
# Convert String float to float list
# using list comprehension + split() + float()

# initializing string
test_str = "3.44, 7.8, 9.12, 100.2, 6.50"

# printing original string
print("The original string is : " + test_str)

# Convert String float to float list
# using list comprehension + split() + float()
res = [float(idx) for idx in test_str.split(', ')]

# printing result
print("The float list is : " + str(res))

Output : 

The original string is : 3.44, 7.8, 9.12, 100.2, 6.50
The float list is : [3.44, 7.8, 9.12, 100.2, 6.5]

Method #2 : Using map() + split() + float()
The combination of above functions can also be used to solve this problem. In this, we perform the task of extending logic to the entire list using map(), rest all the functionalities are performed as above method.

Python3

# Python3 code to demonstrate working of
# Convert String float to float list
# using map() + split() + float()

# initializing string
test_str = "3.44, 7.8, 9.12, 100.2, 6.50"

# printing original string
print("The original string is : " + test_str)

# Convert String float to float list
# using map() + split() + float()
res = list(map(float, test_str.split(', ')))

# printing result
print("The float list is : " + str(res))

Output : 

The original string is : 3.44, 7.8, 9.12, 100.2, 6.50
The float list is : [3.44, 7.8, 9.12, 100.2, 6.5]