Python字符串内建函数

sen = "please enjoy the pain which is unable to avoid."print("Count 可以统计字符出现的次数")print("示例：\n统计P共出现了" + str(sen.count("p")) + "次") 

sen = "please enjoy the pain which is unable to avoid."print("Replace 可以进行替换字符串")print("示例：\n把pain替换成happy => " + str(sen.replace('pain','happy')))

sen = "please enjoy the pain which is unable to avoid."print("Splite 可以指定分隔符，把一个字符串分割为多个字符串。")print("示例：\n以空格为分隔符分割字符串 => " + str(sen.split(" ")))

sen = "please enjoy the pain which is unable to avoid."print("Capitalize 可以将字符串的第一个英文转换为大写。")print("示例：\n转换前："+ sen + "\n转换后：" + str(sen.capitalize()))

sen = "please enjoy the pain which is unable to avoid."ter = "PHP"print("Lower 可以将字符串中的所有英文转换为小写。")print("示例：\n转换前：" + ter + "\n转换后：" + str(ter.lower()))

sen = "please enjoy the pain which is unable to avoid."ter = "PHP"ps = "I have a very lovely cat."print("Swapcase 可以将字符串中英文字母的大小写互换。")print("示例：\n转换前：" + ps + "\n转换后：" + str(ps.swapcase()))

sen = "please enjoy the pain which is unable to avoid."ter = "PHP"ps = "I have a very lovely cat."print("Title 可以将每个单词的首字母转换为大写。")print("示例：\n转换前：" + sen + "\n转换后：" + str(sen.title()))

sen = "please enjoy the pain which is unable to avoid."ter = "PHP"ps = "I have a very lovely cat."print("Upper 可以将变量字符转换为大写字符串")print("示例：\n转换前：" + sen + "\n转换后：" + str(sen.upper()))

sen = "please enjoy the pain which is unable to avoid."ter = "PHP"ps = "I have a very lovely cat."print("Startswith 可以判断字符串指定范围内是否以指定字符开始。")print("示例：")test1 = str(sen.startswith("p"))if(test1 == "True"):    print("如果sen变量句子开头是以p开头你才能看到这条消息~")else:    print("字符串开头不是P！")print("\n") test2 = str(sen.startswith("i"))if(test2 == "True"):    print("如果sen变量句子开头是以i开头你才能看到这条消息~")else:    print("字符串开头不是i！")print("\n") test3 = str(sen.startswith("e",7))if(test3 == "True"):    print("如果sen变量句子第8个字符是以e开头你才能看到这条消息~")else:    print("第八个字符不是e！")print("\n") test4 = str(sen.startswith("o",7))if(test4 == "True"):    print("如果sen变量句子第8个字符是以o开头你才能看到这条消息~")else:    print("第八个字符不是o！")

sen = "please enjoy the pain which is unable to avoid."ter = "PHP"ps = "I have a very lovely cat."print("字符串对齐函数")print("Center 方法可以把原字符串居中,并使用空格填充成指定长度的新字符串，默认的填充字符为空格。")print("示例:\n" + ter.center(50,"="))print("\n") print("ljust/rjust 方法效果同上，区别是左对齐和右对齐。")print("示例：\n" + ter.ljust(50,"*"))print("示例：\n" + ter.rjust(50,"&"))