【Python学习日记-第十二天】

1.定义一个生成器函数，生成1-10

使用next(generator)方法获取1-10
使用for循环获取

def produce_num():
    for i in range(1, 11):
        yield i


gen = produce_num()
print(next(gen), next(gen), next(gen), next(gen), next(gen),
      next(gen), next(gen), next(gen), next(gen), next(gen))

2.模拟range的功能，自己建立一个range:MyRange

range(10)
range(1, 10)
range(1, 10, 1) =>
start, stop, step
range(10, 1, -1)
range(10, -1, -1)
range(-10, -1, 1)
range(-1, -10, -1)

class MyRange:
    def __init__(self, *args):
        if len(args) == 1:
            self.start = 0
            self.stop = args[0]
            self.step = 1
        if len(args) == 2:
            self.start, self.stop = args
            self.step = 1
        if len(args) == 3:
            self.start, self.stop, self.step = args
            if self.step == 0:
                raise ValueError('range() arg 3 must not be zero')

    def __iter__(self):
        return self

    def __next__(self):
        data = self.start
        if self.step > 0:
            if self.start < self.stop:
                self.start += self.step
                return data
            else:
                raise StopIteration
        if self.step < 0:
            if self.start > self.stop:
                self.start += self.step
                return data
            else:
                raise StopIteration

    pass


print(list(MyRange(10)))
print(list(MyRange(1, 10)))
print(list(MyRange(1, 10, 1)))
print(list(MyRange(10, 1, -1)))
print(list(MyRange(10, -1, -1)))
print(list(MyRange(-10, -1, 1)))
print(list(MyRange(-1, -10, -1)))

3. re中函数的使用(自己写用例来使用)

match
fullmatch
search
findall
finditer
split
sub
subn
complie

import re

# match
pattern = "hello"
string = "hello world"
result = re.match(pattern, string)
print(result, type(result))

# fullmatch
pattern = "hello"
string = "hello"
match_obj = re.fullmatch(pattern, string)
print(match_obj)

# search
pattern = "hello"
string = "world hello"
match_obj = re.search(pattern, string)
print(match_obj)

# findall
string3 = "hello world hello"
pattern = "hello"
result = re.findall(pattern, string3)
print(result)

# finditer
string = "hello world hello"
pattern = "hello"
result = re.finditer(pattern, string)
print(result)

# split
string = "计算机,软件,网络"
pattern = ","
result = re.split(pattern, string, maxsplit=1)
print(result)

# sub
result = re.subn(",", "-", "计算机,软件,网络", )
print(result)
result = re.subn(",", "-", "计算机,软件,网络", 1)
print(result)

# subn
result = re.subn(",", "-", "计算机,软件,网络", 1)
print(result)
result = re.subn(",", "-", "计算机,软件,网络",)
print(result)

# complie
string = "hello world hello"
pattern = "hello"
compile_obj = re.compile(pattern)
print(compile_obj.search(string))
print(compile_obj.findall(string))
print(compile_obj.match(string))