试图理解浓缩的Python

Question

我试图了解此代码如何以长格式列出

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

我能想出的最好的是以下内容，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)

但是它会引发以下错误：

TypeError：dict最多需要1个参数，得到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