Question

filename = r"D:\PythonFiles\Python_File.txt"
f = open(filename)

List1 = ['E','H']

for line in f:
if line == List1:
    print(line)

执行此操作时，所有出现的内容都是txt文件的全部内容：

H
E
L
L
O

所有应该打印的是：

H
E

Answer 1

我认为上面的答案是你正在寻找的。但是，为了完整性，并且因为这是一个更好的方式来做你要求做的事情，我还建议使用一个集合交集：

In [20]: f = open('file.txt').read().split('\n')  # Since readlines keeps newlines
    ...: interesting = ['E', 'H']
    ...: set(interesting) & set(f)
    ...:
Out[20]: {'E', 'H'}

Answer 2

使用in，因为它会告诉您某些内容。

filename = r"D:\PythonFiles\Python_File.txt"
f = open(filename)
List1 = ['E','H']

for line in f:
    ## Use the 'in' operator here instead of '=='
    if line in List1:
        print(line)

    ## If List1 is going to be dynamic
    ## else:
    ##     List1.append(line)

Answer 3

# Iterate File contents Line by Line
for line in f.readlines():
    # Remove leading NewLine and Test if line in List1
    if line.strip() in List1:
       # Print's line with NewLine
       print(line)

Answer 4

试一试：

filename = r"D:\PythonFiles\Python_File.txt"
f = open(filename, 'r')
List1 = ['E','H']
for line in f.readlines():
    if line in List1:
        print(line)

打印列表和txt文件中类似的项目

4 个答案: