python 读取 csv 文件时出错

Question

with open('repo-attributes.csv', 'rb') as repofile:
    reader = csv.DictReader(repofile)
    for repo in reader:
        g.add_vertex(name=repo['repository_url'],
            label=repo['repository_url'][19:],
            language='(unknown)' if repo['repository_language'] == 'null'
                else repo['repository_language'],
            watchers=int(repo['repository_watchers']))

这是我的代码。我收到如下错误。我是Python新手。请解释一下。

Traceback (most recent call last):
  File "C:\Python34\github-network-analysis-master\process.py", line 9, in <module>
    for repo in reader:
  File "C:\Python34\lib\csv.py", line 109, in __next__
    self.fieldnames
  File "C:\Python34\lib\csv.py", line 96, in fieldnames
    self._fieldnames = next(self.reader)
_csv.Error: iterator should return strings, not bytes (did you open the file in text mode?)

Answer 1

删除 b，您将以二进制模式打开，因此出现 bytes 错误:

 with open('repo-attributes.csv', newline="") as repofile:

您实际上可以删除两者，因为默认模式是 r。