2021-11-16py10

最新推荐文章于 2024-07-25 20:06:32 发布

原创最新推荐文章于 2024-07-25 20:06:32 发布 · 146 阅读

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#python #开发语言 #后端

本文介绍了Python编程中关于re模块的使用，包括match、fullmatch、search、findall、finditer、split、sub和subn等函数的实例。同时，讲解了如何自定义一个名为Myrange的迭代器类，实现类似range的功能。通过这些示例，读者可以深入理解Python的正则表达式操作和迭代器的实现。

“”"
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 get_num():
for num in range(1, 11):
yield num

gen = get_num()
print(type(gen))

print(next(gen))

for i in gen: # 获取迭代器gen => gen.next()
print(i)
print("=" * 80)
“”"
2.# 自己定义一个MyIterator, 实现range的功能

# range(start, stop, step) => MyIterator

# range(10) # start=0, stop=10, step=1

# rang(10) # range(start=0, stop, step=1) =>start=10

# range(0,10)

# range(0,10,2)

# MyIterator(10)

# MyIterator(0,10)

# MyIterator(0,10,2)

“”"
class Myrange(object):
def init(self, stop=None, start=None, step=1):
self.start = start
self.stop = stop
self.step = step
print(start)

def __iter__(self):
    self.cur_val = self.start
    return self

def __next__(self):

    self.cur_val += self.step
    if self.cur_val < self.stop:

        return self.cur_val

    else:
        raise StopIteration

for i in Myrange(start=-2, stop=13, step=2):
print(i)
print("=" * 80)
“”"
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))
print("=" * 80)

fullmatch

pattern = “hello”
string = “hello”
match_obj = re.fullmatch(pattern, string)
print(match_obj)
print("=" * 80)

search

pattern = “hello”
string1 = “hello world”
string2 = “world hello”
string3 = “hello world hello”
match_obj = re.search(pattern, string1)
print(match_obj)
match_obj = re.search(pattern, string2)
print(match_obj)
match_obj = re.search(pattern, string3)
print(match_obj)
print("=" * 80)

findall

string3 = “hello world hello”
pattern = “hello”
result = re.findall(pattern, string3)
print(result)
print("=" * 80)

finditer

string3 = “hello world hello”
pattern = “hello”
result = re.finditer(pattern, string3)
print(result)
for i in result:
print(i)
print("=" * 80)

split

result = re.split(pattern, string, maxsplit=1)
print(result)
print("=" * 80)

sub

result = re.sub(",", “-”, “计算机,软件,网络”, 1)
print(result)
print("=" * 80)

subn

result = re.subn(",", “-”, “计算机,软件,网络”, 1)
print(result)
print("=" * 80)

complie

string3 = “hello world hello”
pattern = “hello”

compile_obj = re.compile(pattern)
print(compile_obj.search(string3))
print(compile_obj.findall(string3))
print(compile_obj.match(string3))
print("=" * 80)

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