如何从python3中的文本文件中提取和读取数字

Question

Suppose the text file (say, x.txt) is

= 0
< 1
= 2

I want the output to be [0, 1, 2] and ['=', '<', '='] . How can I achieve this in python3?

Answer 1

You can use python's open method to read the file

First, make 2 lists

nums = []
ops = []

Then, use the open method to read file and loop through the lines in the file while adding the operators and numbers to the list.

file = open(“x.txt”, “r”) 
for line in file:
    line = line.split()
    ops.append(line[0])
    nums.append(line[1])

Then print if wanted.

print(ops, nums)

Answer 2

a=[]
b=[]
with open("x.txt","r") as file:
    for line in file:
        a.append(line.split()[0])
        b.append(line.split()[1])
print (a)
print (b)

Answer 3

Very straight forward. Just make empty lists, iterate over lines in file using with open and readlines method. Append to the lists. Cheers.

#init lists 
nums = [] 
operators = []

#open file, iterate over lines, append values 
with open('x.txt', 'r') as f:
    for line in f.readlines():
        _line = line.split()
        nums.append(_line[1])
        operators.append(_line[0])