字典的添加谓晌、刪除、修改操作
dict = {"a" : "apple", "b" : "banana", "g" : "grape", "o" : "orange"}
dict["w"] = "watermelon" #添加
del(dict["a"]) #刪除
dict["g"] = "grapefruit"
print dict.pop("b")
print dictdict.clear() #清空
print dict
字典的遍歷
dict = {"a" : "apple", "b" : "banana", "g" : "grape", "o" : "orange"}
for k in dict:
print "dict[%s] =" % k,dict[k]
字典items()的使用
dict = {"a" : "apple", "b" : "banana", "c" : "grape", "d" : "orange"}
每個元素是一個key和value組成的元組此迅，以列表的方式輸出print dict.items()
調(diào)用items()實現(xiàn)字典的遍歷
dict = {"a" : "apple", "b" : "banana", "g" : "grape", "o" : "orange"}
for (k, v) in dict.items():
print "dict[%s] =" % k, v
調(diào)用iteritems()實現(xiàn)字典的遍歷
dict = {"a" : "apple", "b" : "banana", "c" : "grape", "d" : "orange"}
print dict.iteritems()
for k, v in dict.iteritems():
print "dict[%s] =" % k, v
for (k, v) in zip(dict.iterkeys(), dict.itervalues()):
print "dict[%s] =" % k, v
每個元素是一個key和value組成的元組蜜宪，以列表的方式輸出
print dict.items()
dict = {"a" : "apple", "b" : "banana", "c" : "grape", "d" : "orange"}
it = dict.iteritems()
print it
遍歷字典里面的內(nèi)容
dict = {'name':'python','english':33,'math':35}
print dict.items()
for i, j in dict.items():
print 'dict[%s]=' % i, j
#結(jié)果
[('name', 'python'), ('math', 35), ('english', 33)]
dict[name]= python
dict[math]= 35
dict[english]= 33
或者：
dict = {'name':'python','english':33,'math':35}
for i in dict:
print 'dict[%s]=' % dict[i]
結(jié)果：
dict[name]= python
dict[math]= 35
dict[english]= 33
-------------------------------------------
success_rate = {1:'1000000',2:'200000',3:'30000'}
for k in success_rate:
print success_rate[k]
print k
結(jié)果：
1000000
1
200000
2
30000
3
或者：
for k,v in dict.iteritems():
print 'dict[%s]' % k, v
結(jié)果：
dict[name] python
dict[math] 35
dict[english] 33