Python允许将多个
open()语句放在一个语句中
with。你用逗号分隔。你的代码将是：
def filter(txt, oldfile, newfile): ''' Read a list of names from a file line by line into an output file. If a line begins with a particular name, insert a string of text after the name before appending the line to the output file. ''' with open(newfile, 'w') as outfile, open(oldfile, 'r', encoding='utf-8') as infile: for line in infile: if line.startswith(txt): line = line[0:len(txt)] + ' - Truly a great person!n' outfile.write(line)# input the name you want to check againsttext = input('Please enter the name of a great person: ') letsgo = filter(text,'Spanish', 'Spanish2')不，通过return在函数的末尾放置一个显式字符不会获得任何收益。你可以使用return提前退出，但最后要退出，并且该函数将在没有退出的情况下退出。（当然，对于返回值的函数，你可以使用return来指定要返回的值。）
引入该语句时，Python 2.5 或Python 2.6 不支持open()与一起使用多个项目，但Python 2.7和Python 3.1或更高版本with支持使用多个项目with。
http://docs.python.org/reference/compound_stmts.html#the-with-statement http://docs.python.org/release/3.1/reference/compound_stmts.html#the-with-statement
如果要编写必须在Python 2.5、2.6或3.0中运行的代码，则将with语句嵌套为建议的其他答案或使用contextlib.nested。
