tuple的功能

collections模块讲解的内容

hjijojiiojio

实例:
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))

实例：
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)

实例：

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 调用自定义函数
default_dict_custom_func = defaultdict(func1)
#defaultdict 调用内置函数
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']))

实例：
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 统计功能