Question

我尝试在用户从文本文件中输入的代码下打印2行。

我的文字档案：

86947367
banana
5

78364721
apple
3

35619833
orange
2

84716491
sweets
8

46389121
chicken
10

因此，如果用户输入例如46389121，则会打印

chicken
    10

我试过了：

file = 'read_it.txt'
user = input('Enter code')

with open(file, 'r') as f:
    lines = f.readlines()
    for i, line in enumerate(lines):  # enumerate will count and keep track      of the lines
      if line == user:
            print("{}\n{}".format(lines[i+1], lines[i+2]))

但它给了我一个空白行的输出，请帮忙吗？

Answer 1

在使用rstrip()进行比较之前尝试剥离线：

file = 'read_it.txt'
user = input('Enter code')

with open(file, 'r') as f:
    lines = f.readlines()
    for i, line in enumerate(lines):  # enumerate will count and keep track      of the lines
      if line.rstrip() == user:
            print("{}\n{}".format(lines[i+1], lines[i+2]))

请记住，您不必一次加载所有文件，而是可以像这样迭代它：

file = 'read_it.txt'
user = input('Enter code')

with open(file, 'r') as f:
    for line in f:
        if line.rstrip() == user:
            print(next(f).rstrip())
            print(next(f).rstrip())
            break

rstrip()函数删除字符串末尾的空格。空白包括，\n，\t，\r等。

在用户输入下打印2行？

1 个答案: