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tuple的功能

collections模塊講解的內(nèi)容

hjijojiiojio

實(shí)例:
from?collections?import?Counter

str_t?=?"dsjakldjakljdakjdadlkjasdklajkdja"
list_t?=?['tom',?'tom1',?'tom2',?'tom1',?'tom1',?'tom']
tuple_t?=?('tom',?'tom1',?'tom2',?'tom1',?'tom1',?'tom')
dict_t?=?{
????"tom":?"male",
????"tom1":?"male",
}
print(Counter(str_t))
print(Counter(list_t))
print(Counter(tuple_t))
print(Counter(dict_t.values()))
ls_counter?=?Counter(list_t)
ls_counter.update(["tom4"])
print(ls_counter)
print(ls_counter.most_common(2))

實(shí)例：
from?collections?import?deque

list_t?=?["tom_l",?"jane_l",?"bob_l"]
tuple_t?=?("tom_t",?"jane_t",?"bob_t")
dict_t?=?{
????"tom_d":?"male",
????"jane_d":?"female",
????"bob_d":?"male"
}
deq?=?deque(dict_t)
deq.append("tim")
deq.appendleft("lewin")
deq.extend(tuple_t)
deq.extendleft(list_t)
deq.popleft()
deq.pop()
deq.remove("lewin")
deq.reverse()
print(deq.index("tim"))
print(deq)

實(shí)例：

from?collections?import?defaultdict
from?datetime?import?datetime


def?func1():
????return?None


dict_t?=?{}
default_dict?=?defaultdict(int)
key_str?=?"dskjakdljadakd"
for?k?in?key_str:
????dict_t.setdefault(k,?0)
????dict_t[k]?+=?1
????default_dict[k]?+=?1
print("dict_t:?{dict_t}\ndefault_dict:?{default_dict}".format(dict_t=dict_t,?default_dict=default_dict))
##defaultdict?調(diào)用自定義函數(shù)
default_dict_custom_func?=?defaultdict(func1)
#defaultdict?調(diào)用內(nèi)置函數(shù)
default_dict_sys_func?=?defaultdict(datetime.now)
print("\ndefault_dict_custom_func:?{0}\ndefault_dict_sys_func:?{1}".format(default_dict_custom_func['func'],?default_dict_sys_func['func']))

實(shí)例：
from?collections?import?namedtuple


key_s?=?("name",?"age",?"gender",?"birthday")
User?=?namedtuple("User",?key_s)
value_s?=?("lewin",?29,?"male")

value_dict?=?{
????"name":?"tim",
????"age":?19,
????"gender":?"male"
}

value_make?=?("lily",?"18",?"female",?"2001-02-02")

user_tuple?=?User(*value_s,?"1990-01-01")
user_dict?=?User(**value_dict,?birthday="2000-02-28")
user_make?=?User._make(value_make)
user_order?=?user_make._asdict()

print("user_tuple:?{0}\nuser_dict:?{1}\nuser_make:?{2}\nuser_order:?{3}".format(user_tuple,?user_dict,?user_make,?user_order))

counter 統(tǒng)計(jì)功能