如何读取并打印文件，跳过python中的某些行

Question

我想逐行读取文件，但忽略任何包含冒号（：）的文件

我目前正在打开一个文件，阅读它，并试图打印它，最后把它放入一个新的文件

def shoppinglist():
    infile = open('filename.txt')
    contents = infile.readline()
    output = open('outputfilename.txt', 'w')
    while ":" not in contents:
        contents = infile.readline()
    else:
        contentstr = contents.split()
        print(contentstr)
    output.write(contents)
    infile.close()
    output.close()

事实上，一行字反复出现

Answer 1

尝试：

def shoppinglist():
    contents = ""
    with open('filename.txt', 'r') as infile:
        for line in infile.readlines():
            if ":" not in line:
                contents += line

    with open('outputfilename.txt', 'w') as output_file:
        output_file.write(contents)