python3.x读取csv遇到的bug

import csv def main(): reader=csv.reader(open('userid.csv', 'rb')) for item in reader: print(item) if __name__ == '__main__': main()

Sorry, folks, we've got an understanding problem here. CSV files are
typically NOT created by text editors. They are created e.g. by "save as
csv" from a spreadsheet program, or as an output option by some database
query program. They can have just about any character in a field,
including \r and \n. Fields containing those characters should be quoted
(just like a comma) by the csv file producer. A csv reader should be
capable of reproducing the original field division. Here for example is
a dump of a little file I just created using Excel 2003:
...

This sentence in the documentation is NOT an error: """If csvfile is a
file object, it must be opened with the ‘b’ flag on platforms where that
makes a difference."""

import csv def main(): reader=csv.reader(open('userid.csv', 'r')) for item in reader: print(item) if __name__ == '__main__': main()

    # Errors and Exceptions
    # 详细文档参考：http://docs.python.org/2/tutorial/errors.html
    try:
        f = codecs.open("noexistfile.txt", "rU", "utf-8")
        text = f.read()
    except Exception:
        sys.stderr.write('读取文件发生IO异常！\n')
    finally:
        f.close()
        sys.stderr.write('finnaly执行！\n')

  # Errors and Exceptions
    # 详细文档参考：http://docs.python.org/2/tutorial/errors.html
    try:
        f = codecs.open("noexistfile.txt", "rU", "utf-8")
        text = f.read()
        f.close()
    except Exception:
        sys.stderr.write('读取文件发生IO异常！\n')
    finally:
        sys.stderr.write('finnaly执行！\n')

with open("test.txt", "r") as file_handle:
    for line in file_handle:
       # ...