python - 试图理解精简的 Python

Question

我试图理解这段代码如何以长格式布局

proposed = dict((k, v) for k, v in args.iteritems() if v is not None)

我能想到的最好的是以下，但它不起作用:

for k,v in args.iteritems():
    print "value of v is: %s" % v
    if v is not None:
    proposed = dict(k,v)

但是它会抛出以下错误:

TypeError: dict expected at most 1 arguments, got 2

Answer 1

尝试:

proposed=dict()
for k,v in args.iteritems():
  print "value of v is: %s" % v
  if v is not None:
    proposed[k] = v #This is the part you got wrong