SyntaxError Python -segments.get中的段(‘items’，[])：

Question

我有一个Python脚本，它利用Google，并且在我的for循环中得到了一个语法错误。

脚本

def get_segments():

    try:
      segments = analytics.management().segments().list().execute()

#   except TypeError, error:
        # Handle errors in constructing a query.
#       print 'There was an error in constructing your query : %s' % error

#   except HttpError, error:
        # Handle API errors.
#       print ('There was an API error : %s : %s' %(error.resp.status, error.resp.reason))

    # Example #2:
    # The results of the list method are stored in the segments object.
    # The following code shows how to iterate through them.
    for segment in segments.get('items', []):
      print 'Segment Id         = %s' % segment.get('id')
      print 'Segment kind       = %s' % segment.get('kind')
      print 'Segment segmentId  = %s' % segment.get('segmentId')
      print 'Segment Name       = %s' % segment.get('name')
      print 'Segment Definition = %s' % segment.get('definition')
      if segment.get('created'):
        print 'Created    = %s' % segment.get('created')
        print 'Updated    = %s' % segment.get('updated')
      print

误差

File "scripty.py", line 87
    for segment in segments.get('items', []):
      ^
SyntaxError: invalid syntax 

Answer 1

语法错误不是在for中，而是因为您已经注释掉了与try匹配的out子句。尝试而不尝试是错误的。

Answer 2

for循环不缩进。Python根据缩进分离块。除此之外，如果您使用的是try，您还必须使用catch块。这样的内容应该可以解决语法错误：

try:
  segments = analytics.management().segments().list().execute()
  for segment in segments.get('items', []):
    print 'Segment Id         = %s' % segment.get('id')
    print 'Segment kind       = %s' % segment.get('kind')
    print 'Segment segmentId  = %s' % segment.get('segmentId')
    print 'Segment Name       = %s' % segment.get('name')
    print 'Segment Definition = %s' % segment.get('definition')
    if segment.get('created'):
      print 'Created    = %s' % segment.get('created')
      print 'Updated    = %s' % segment.get('updated')
    print
except Exception as e:
  print "Exception Caught!"

Answer 3

这可能是因为您有一个try块而没有except或finally块。如果for循环用于当try块失败时，将其放置在一个put块中：

def get_segments():
    try:
        segments = analytics.management().segments().list().execute()
    except:
        for segment in segments.get('items', []):
            print 'Segment Id         = %s' % segment.get('id')
            print 'Segment kind       = %s' % segment.get('kind')
            print 'Segment segmentId  = %s' % segment.get('segmentId')
            print 'Segment Name       = %s' % segment.get('name')
            print 'Segment Definition = %s' % segment.get('definition')
            if segment.get('created'):
                print 'Created    = %s' % segment.get('created')
                print 'Updated    = %s' % segment.get('updated')
            print

通常，如果存在多个异常，则应该指定要通过are块(例如except ValueError:或except (RuntimeError, TypeError, NameError): )捕获哪种类型的异常。如果希望执行该块，而不管是否发生错误，则应将其放入finally中。