在python中将文件中的数据作为float导入

Question

I have a file, variables.txt , when I input a float, say 7.75 , it inputs it into the file as 7.75 . When I get the information back from the file, I get ['7.75'] . I'm assuming this is a list. How would I be able to change ['7.75'] back to a float, 7.75, so that it can be multiplied, divided, etc.

Answer 1

将列表中的第一个条目转换为float()值：

value = float(somelist[0])

Answer 2

This code will open a text file with a float on each line and give you a list of float s

with open('floats.txt', 'r') as f:
    floats = []
    for each in f:
        floats.append(float(each.strip()))

print(floats)

you can then access each float in the list by it's index:

float[0] #this will give you the first entry in the list

File:

7.75
1.23
4.56

Output:

[7.75, 1.23, 4.56]

Answer 3

In Python, how do I convert all of the items in a list to floats?

To reiterate, you want to loop through the list and convert all element to float values using the "float" function.