python3_字符串

def strCase():    print("字符串大小写转换")    print("演示字符串大小写转换")    print("演示字符串S赋值为：'  ThIs is a PYTHON  '")    S = '  ThIs is a PYTHON  '    print("大写转换成小写：\tS.lower() \t= %s" % (S.lower()))    print("小写转换成大写：\tS.upper() \t= %s" % (S.upper()))    print("大小写转换：\t\tS.swapcase() \t= %s" % (S.swapcase()))    print("首字母大写：\t\tS.title() \t= %s" % (S.title()))    print('\n')def strFind():    print("字符串搜索、替换")    print("演示字符串搜索、替换等")    print("演示字符串S赋值为：'  ThIs is a PYTHON  '")    S = '  ThIs is a PYTHON  '    print("字符串搜索：\t\tS.find('is') \t= %s" % (S.find('is')))    print("字符串统计：\t\tS.count('s') \t= %s" % (S.count('s')))    print("字符串替换：\t\tS.replace('Is','is') = %s" % (S.replace('Is', 'is')))    print("去左右空格：\t\tS.strip() \t=#%s#" % (S.strip()))    print("去左边空格：\t\tS.lstrip() \t=#%s#" % (S.lstrip()))    print("去右边空格：\t\tS.rstrip() \t=#%s#" % (S.rstrip()))    print('\n')def strSplit():    print("字符串分割、组合")    print("演示字符串分割、组合")    print("演示字符串S赋值为：'  ThIs is a PYTHON  '")    S = '  ThIs is a PYTHON  '    print("字符串分割：\t\tS.split() \t= %s" % (S.split()))    print("字符串组合1： '#'.join(['this','is','a','python']) \t= %s" % ('#'.join(['this', 'is', 'a', 'python'])))    print("字符串组合2： '$'.join(['this','is','a','python']) \t= %s" % ('$'.join(['this', 'is', 'a', 'python'])))    print("字符串组合3： ' '.join(['this','is','a','python']) \t= %s" % (' '.join(['this', 'is', 'a', 'python'])))    print('\n')def strCode():    print("字符串编码、解码")    print("演示字符串编码、解码")    print("演示字符串S赋值为：'编码解码测试'")    S = '编码解码测试'    print("GBK编码的S \t = %s" % (S))    print("GBK编码的S转换unicode编码")#    print("S.decode('GBK')= %s" % (S.decode("GBK")))    print("GBK编码的S转换成utf8")#    print("S.decode('GBK').encode('utf8') = %s" % (S.decode("GBK").encode("utf8")))    print("注意：不管是编码还是解码针对的都是unicode字符编码，\n所以要编码或者解码前必须先将源字符串转换成unicode编码格式")    print('\n')def strTest():    print("字符串测试")    print("演示字符串测试")    print("演示字符串S赋值为：'abcd'")    S1 = 'abcd'    print("测试S.isalpha() = %s" % (S1.isalpha()))    print("测试S.isdigit() = %s" % (S1.isdigit()))    print("测试S.isspace() = %s" % (S1.isspace()))    print("测试S.islower() = %s" % (S1.islower()))    print("测试S.isupper() = %s" % (S1.isupper()))    print("测试S.istitle() = %s" % (S1.istitle()))if __name__ == '__main__':    strCase()    strFind()    strSplit()    strCode()    strTest()