python读取文件时\n问题处理

存在如下配置文件1.txt

123456
09876

with open('1.txt', 'r', encoding="utf-8") as f:
    conds = []
    for i in range(2):
        conds.append(f.readline())
    print(conds)
输出为 ['123456\n', '09876\n']

with open('1.txt', 'r', encoding="utf-8") as f:
    conds = []
    for i in range(2):
        conds.append(f.readline())
    print(conds[0])
输出为 123456
误以为 \n 已经被自动过滤掉了

由于需要在文件里面获取信息与其他信息作比较，发现结果与预期不符

with open('1.txt', 'r', encoding="utf-8") as f:
    conds = []
    for i in range(2):
        conds.append(f.readline())
    if conds[0] in '123456789':
        print(1)
    else:
        print(0)
以为会输出1，结果输出0
遂发现\n实际是生效的
修正后为

with open('1.txt', 'r', encoding="utf-8") as f:
    conds = []
    for i in range(2):
        conds.append(f.readline().rstrip('\n'))
    if conds[0] in '123456789':
        print(1)
    else:
        print(0)

输出1