Convert String Float to Float List in Python

We are given a string float we need to convert that to float of list. For example, s = '1.23 4.56 7.89' we are given a list a we need to convert this to float list so that resultant output should be [1.23, 4.56, 7.89].

Using split() and map()

By using split() on a string containing float numbers, we can break it into individual string elements and then apply map() to convert each element into a float. This produces a list of floats derived from the original string.

s = '1.23 4.56 7.89' 
# Split the string 's' into a list of substrings and convert each substring to a float using map
f = list(map(float, s.split()))
print(f)

[1.23, 4.56, 7.89]

Explanation:

• s.split() splits the string s at each space, producing a list of string representations of the float values.
• map(float, ...) applies the float function to each element of the list, converting the strings to floats, and list() creates a list from the resulting map object.

Using List Comprehension

We can split a string into individual elements and convert each element to a float in one line using list comprehension, resulting in a concise list of float values from the original string.

s = '1.23 4.56 7.89'  # Define a string 's' containing float values separated by spaces

# Use list comprehension to split the string and convert each element to a float
f = [float(x) for x in s.split()]
print(f)

[1.23, 4.56, 7.89]

Explanation:

• s.split() splits the string s into a list of substrings, each representing a float value, based on spaces.
• The list comprehension [float(x) for x in s.split()] converts each substring into a float and stores the results in the list f.

Using re.split()

re.split() function can be used to split a string based on a regular expression pattern (such as spaces or other delimiters) and then map() or a list comprehension can convert each substring into a float. This method provides greater flexibility in handling different delimiters when splitting the string.

import re  
s = '1.23,4.56;7.89'

# Use re.split() to split the string by both commas and semicolons
f = [float(x) for x in re.split('[,;]', s)]
print(f)

[1.23, 4.56, 7.89]

Explanation:

• re.split('[,;]', s) splits the string s at both commas and semicolons, using the regular expression pattern [ , ; ] to match these delimiters.
• The list comprehension [float(x) for x in re.split('[,;]', s)] converts each substring (split by the delimiters) into a float and stores them in the list f.