#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/10/30 10:13 上午
# @Author : LeiXueWei
# @CSDN/Juejin/Wechat: 雷學(xué)委
# @XueWeiTag: CodingDemo
# @File : string_funs_cat1.py
# @Project : hello
import sys

slogan = "keep studying, keep coding, I am Levin"

# 判斷結(jié)構(gòu)
print("算某個(gè)子串出現(xiàn)數(shù)次: slogan.count('keep') = ", slogan.count('keep'))
print("找某個(gè)子串首次出現(xiàn)的下標(biāo): slogan.find('keep') = ", slogan.find('keep'))
print("找某個(gè)子串最后出現(xiàn)的下標(biāo): slogan.rfind('keep') = ", slogan.rfind('keep'))
print("找某個(gè)子串下標(biāo): slogan.index('keep') = ", slogan.index('keep'))
print("找某個(gè)子串下標(biāo): slogan.rindex('keep') = ", slogan.rindex('keep'))
print("是否'keep'開頭的字符串: slogan.startswith('keep') = ", slogan.startswith('keep'))
print("是否'keep'結(jié)束的字符串: slogan.endswith('keep') = ", slogan.endswith('keep'))


# 字符串屬性相關(guān)
print("字符串長(zhǎng)度： len(slogan) = ", len(slogan))
print("字符串是否都是空格： slogan.isspace() = ", slogan.isspace())
print("字符串是否大寫： slogan.isupper() = ", slogan.isupper())
print("字符串是否小寫： slogan.islower() = ", slogan.islower())
print("字符串是否為每個(gè)詞首字母都大寫： slogan.istitle() = ", slogan.istitle())

# 判斷字符串?dāng)?shù)據(jù)類型
print("字符串是否全為字母： slogan.isalpha() = ", slogan.isalpha())
print("字符串是否全為數(shù)字： slogan.isalnum() = ", slogan.isalnum())
print("字符串是否數(shù)字： slogan.isnumeric() = ", slogan.isnumeric())
print("字符串是否浮點(diǎn)數(shù)： slogan.isdecimal() = ", slogan.isdecimal())
print("字符串是否為空格串： slogan.isspace() = ", slogan.isspace())

讀者可以直接復(fù)制運(yùn)行代碼，學(xué)委補(bǔ)充了運(yùn)行效果圖：

第二類字符串編輯的操作

下面學(xué)委準(zhǔn)備了一些代碼展示：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/10/30 10:13 上午
# @Author : LeiXueWei
# @CSDN/Juejin/Wechat: 雷學(xué)委
# @XueWeiTag: CodingDemo
# @File : string_funs_cat2.py
# @Project : hello
import sys

slogan = "keep studying, keep coding, I am Levin"

print("首字母大寫: slogan.capitalize() = ", slogan.capitalize())
print("全部字母大寫: slogan.upper() = ", slogan.upper())
print("全部字母小寫: slogan.lower() = ", slogan.lower())
print("轉(zhuǎn)為首字母都大寫（標(biāo)題風(fēng)格）： slogan.title() = ", slogan.title())
print("大小寫逆轉(zhuǎn)： slogan.swapcase() = ", slogan.swapcase())

table = slogan.maketrans({"e": "5"})
print("字符串替換表： slogan.translate(table) = ", slogan.translate(table))

# 字符串替換，合并，填充等
print("替換tabs為n個(gè)空格: 'hello\t學(xué)委'.expandtabs(4) = '", "hello\t學(xué)委".expandtabs(4))
print("左子串來串聯(lián)傳入的列表: ' '.join(slogan) = '", " ".join(slogan))
print("替換子串: ' '.replace(first, second) = '", slogan.replace("e", "11"))
print("填充0值: slogan.rzfill(2)= '", slogan.zfill(50))
print("填充#值: slogan.rjust(50,"#")= '", slogan.rjust(50,"#"))
print("填充#值: slogan.ljust(50,"#")= '", slogan.ljust(50,"#"))
print("移除首尾空格: slogan.strip()= '", slogan.strip())

data = slogan.split("e")
print("split slogan into data= ", data)

運(yùn)行效果如下：

第三類：字符串跟字節(jié)串的互轉(zhuǎn)

下面學(xué)委準(zhǔn)備了一些代碼展示：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/10/30 10:13 上午
# @Author : LeiXueWei
# @CSDN/Juejin/Wechat: 雷學(xué)委
# @XueWeiTag: CodingDemo
# @File : string_funs_cat3.py
# @Project : hello
import sys

slogan = "keep studying, keep coding, I am Levin"
bytes = slogan.encode("utf-8")
print("type of encoded string = ", type(bytes))
# 注意python的string類型沒有decode函數(shù)，該函數(shù)屬于bytes類型對(duì)象特有！??！
print("type of decoded byte = ", type(bytes.decode("utf-8")))
print("type of decoded byte = ", bytes.decode("utf-8"))

運(yùn)行效果如下：