python讀取文件時\n問題處理

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)
輸出為 ['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])
輸出為 123456
誤以為 \n 已經被自動過濾掉了

由於需要在文件里面獲取信息與其他信息作比較，發現結果與預期不符

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)
以為會輸出1，結果輸出0
遂發現\n實際是生效的
修正后為

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)

輸出1