>>> dict(a=2,b=4)
{'a': 2, 'b': 4}

将在python字典中添加该值。

d = dict()

or

d = {}

or

import types
d = types.DictType.__new__(types.DictType, (), {})

所以有两种方法来创建字典:

My_dict = dict() My_dict = {}

但在这两个选项中，{}比dict()加上它的可读性更有效。 检查在这里

不带参数调用dict

new_dict = dict()

或者简单地写

new_dict = {}

知道如何编写预先设定的字典也很有用:

cmap =  {'US':'USA','GB':'Great Britain'}

# Explicitly:
# -----------
def cxlate(country):
    try:
        ret = cmap[country]
    except KeyError:
        ret = '?'
    return ret

present = 'US' # this one is in the dict
missing = 'RU' # this one is not

print cxlate(present) # == USA
print cxlate(missing) # == ?

# or, much more simply as suggested below:

print cmap.get(present,'?') # == USA
print cmap.get(missing,'?') # == ?

# with country codes, you might prefer to return the original on failure:

print cmap.get(present,present) # == USA
print cmap.get(missing,missing) # == RU

>>> dict(a=2,b=4)
{'a': 2, 'b': 4}

将在python字典中添加该值。