我如何让 python 在文件中查找范围？

Question

I am trying to make python open a file, and return all lines where POINTBALANCE = <value> is in the given range

num = input("Points to check: ")
num2 = num + str(100)

with open("glist.txt") as search:
    for line in search:
        if "POINTS BALANCE = " + num <= num <= num2 in line:
            print(line)

I want it to be so that if I input 100 in num that python automatically checks for POINTSBALANCE - with 100 to 200 and then when I put 200 in num i want it to check for 200 to 300

Answer 1

You might want to try extracting the number from the line (if POINTSBALANCE = exists) using a regular expression. Without example data it is bit of a guessing game and making assumptions, but for inspiration:

import re

num = int(input("Points to check: "))
delta = 100

pattern = 'POINTSBALANCE = (\d+)'
with open("glist.txt") as search:
    for line in search:
        regex = re.search(pattern, line)
        if regex and num <= int(regex.group(1)) <= num + delta:
            print(line)

Answer 2

As already was pointed out in some comments you should cast integer strings to int to compare them with numbers.

Python's strings offer enough convenient functions to achieve your task here, namely

str.startswith(substring) - self explaining
str.split() - creating a list of substrings, by default split at spaces
str.strip() - remove unwanted characters at beginning and end

So your code could be changed to

num = int(input("Points to check: "))
num2 = num + 100

with open("glist.txt") as search:
    for line in search:
        if line.startswith("POINTS BALANCE = "):
            x = int(line.split('=')[-1].strip())
            if  (num <= x) and (x <= num2):
                print(line)