简析Python函数式编程字符串和元组及函数分类与高阶函数

my_str = "xiangpica"
print(my_str.upper())
print(len(my_str.upper()))

# 类型 Text 是 str 的别名
from typing import Text
my_str = "xiangpica"
def upper(str: Text) -> Text:
    return str.upper()
print(upper(my_str))
print(len(upper(my_str)))

from typing import Tuple, Text, Callable
LANGUAGE = Tuple[Text, Text, Text]
python: Callable[[LANGUAGE], Text] = lambda languages: languages[1]
items = ("c","python","js")
a = python(items)
print(a)

from collections import  namedtuple
Language = namedtuple("Language",("name1", "name2", "name3"))
l = Language("c", "python", "js")
print(l)
print(l.name1)

from typing import NamedTuple, Text
class Language(NamedTuple):
    name: Text
    description: Text
l = Language("C", "C语言")
print(l)
print(l.name)
print(l.description)

a = zip()
print(list(a))

max_num = max(1, 2, 3, 4)
min_num = min(1, 2, 3, 4)
print(max_num)
print(min_num)

# 第一种写法，比较字符串长度
max_num = max("a", "abc", "ceda", "aaaaa", key=lambda x: len(x))
min_num = min("a", "abc", "ceda", "aaaaa", key=lambda x: len(x))
print(max_num)
print(min_num)
# 第二种写法，比较字符串长度
max_num = max(["a", "abc", "ceda", "aaaaa"], key=lambda x: len(x))
min_num = min(["a", "abc", "ceda", "aaaaa"], key=lambda x: len(x))
print(max_num)
print(min_num)

data = ["1", "2", "3"]
print(map(int, data))
print(list(map(int, data)))

data = ["1", "2", "3"]
print(map(lambda x: int(x), data))
print(list(map(int, data)))

data = [1, 3, 5, 7, 9]
print(filter(lambda x: x > 3, data))
print(list(filter(lambda x: x > 3, data)))

result = sorted(["afghsss", "abc", "ceda", "aaaaa"], key=lambda x: len(x))
print(result)

import time
def demo(x):
    return x * 2
def demo1(f, l):
    for x in l:
        yield f(x)
my_list = list(range(1, 10000000))
start = time.perf_counter()
# map(lambda x: x * 2, my_list) # 程序运行耗时 3.904999999998493e-06
# (demo(x) for x in my_list) # 程序运行耗时 6.310000000009364e-06
demo1(demo, my_list) # 程序运行耗时 5.1070000000041915e-06
cost_time = time.perf_counter() - start
print("程序运行耗时", cost_time)