Skip to content
Related Articles
Python – Summation of float string list
• Last Updated : 11 Dec, 2019

Sometimes, while working with Python list, we can have a problem in which we need to find summation in list. But sometimes, we don’t have a natural number but a floating-point number in string format. This problem can occur while working with data, both in web development and Data Science domain. Let’s discuss the ways in which this problem can be solved.

Method #1 : Using `sum() + float() `+ generator
This problem can be solved using the sum function in which we first convert the strings into float and then pass this logic in functions in respective sum function.

 `# Python3 code to demonstrate working of``# Summation of float string list``# using sum() + float() + generator`` ` `# initialize lists``test_list ``=` `[``'4.5'``, ``'7.8'``, ``'9.8'``, ``'10.3'``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# Summation of float string list``# using sum() + float() + generator``res_sum ``=` `sum``(``float``(sub) ``for` `sub ``in` `test_list)`` ` `# printing result``print``(``"The summation of float string list : "` `+` `str``(res_sum))`
Output :
```The original list is : ['4.5', '7.8', '9.8', '10.3']
The summation of float string list : 32.400000000000006
```

Method #2 : Using loop
This is a brute force method to perform this task. In this, we iterate for the list and convert and sum the list float elements during iteration.

 `# Python3 code to demonstrate working of``# Summation of float string list``# Using loop`` ` `# initialize lists``test_list ``=` `[``'4.5'``, ``'7.8'``, ``'9.8'``, ``'10.3'``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# Summation of float string list``# Using loop``res_sum ``=` `0` `for` `ele ``in` `test_list: ``    ``res_sum ``+``=` `float``(ele)``     ` `# printing result``print``(``"The summation of float string list : "` `+` `str``(res_sum))`
Output :
```The original list is : ['4.5', '7.8', '9.8', '10.3']
The summation of float string list : 32.400000000000006
```

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course

My Personal Notes arrow_drop_up