String operations on python

 
  String determination operation:
 
 
 
   = str " fahaf asdkfja \ T \ R & lt \ n-fjdhal 3453 " 
Print ( str.isspace () )   # If str contains only spaces Returns True 
Print (str.isalnum ())   # If str at least one character and all True character is a number or letter is returned 
Print (str.isalpha ())   # If str has at least one character and all characters are letters returns True 
Print (str.isdecimal ())   # If the string contains only digit returns True , full-width digital 
Print (str.isdigit ())   #   If the string contains only digit returns True, full-width figures, (1), \ u00b2 ---> (Unicode) 
Print (str.isnumeric ())   #   If the string contains only digital returns True, full-width numbers, characters digital 
Print (str.istitle ())   # If the string is the title of (each word is capitalized) True returns 
Print (str.islower ())   #All of these (case-sensitive) if the character string contains at least one of alphanumeric characters, and all lowercase, True is returned 
Print (str.isupper ())   #   at least a case-sensitive character string if included, and all of these (case-sensitive) characters are uppercase, True is returned 
  
 
Find the replacement string operations:
 
   str = "hello hello"
print(str.startswith("hello"))  # 检查字符串是否是以hello开头，是则返回True
print(str.endswith("hello"))  # 检查字符串是否是以hello结束，是则返回True
print(str.find("lo"))  # 检测lo是否包含在str中，如果start和end指定范围，则检查是否包含在指定范围内，如果是返回开始的索引值，否则返回 -1
print(str.rfind("lo"))  #类似于find()方法，不过是从右边开始查找
print(str.index("lo"))  #跟find()方法类似，只不过如果lo不在str会报错                          
print(str.rindex("lo"))  # 类似于index()方法，不过是从右边开始查找
print(str.replace("hello", "HELLO", 1)) # 将hello替换为HELLO，替换次数为1次 
  
大小写转换：
 
   # 大小写转换
str = "hello pyTHon"
print(str.capitalize())  # 把字符串的第一个字母大写
print(str.title())  # 首字母大写
print(str.lower())  # 将所有大写转换为小写
print(str.upper())  # 将所有小写转换为大写
print(str.swapcase())  # 将大小写翻转 
  
 
     
   
 
    文本对齐： 
   
 
     # 文本对齐
poem = ["静夜思",
"李白",
"床前明月光",
"疑似地上霜",
"举头望明月",
"低头思故乡"]
for i in poem:  # 左对齐，返回一个填充10个单位的全角空格字符串
    print("|%s|" % i.ljust(10), "　")
print()

for i in poem:  # 右对齐，返回一个填充10个单位的全角空格字符串
    print("|%s|" % i.rjust(10), "　")
print()


for i in poem:  # 居中，返回一个填充10个单位的全角空格字符串
    print("|%s|" % i.center(10, "　")) 
    
去除空白：
 
     # 去除空白
poem = ["静夜思",
"李白",
"\t\n床前明月光",
"疑似地上霜\t",
"\t举头望明月\t\n",
"低头思故乡"]

for i in poem:  # 去除左侧空白字符
    print("|%s|" % i.lstrip())
print("*" * 10)

for i in poem:  # 去除右侧空白字符
    print("|%s|" % i.rstrip())
print("*" * 10)

for i in poem:  # 去除两侧空白字符
    print("|%s|" % i.strip()) 
    
 
      拆分和连接 
     
 
       # 拆分和连接
str = "how are you"
print(str.partition(" "))  # 把字符串分成一个3元素的元组
print(str.rpartition(" "))  # 类似partition()方法，不过是从右边开始
print(str.split())  # 以空白字符（\r \t \n 空格）为分隔符拆分字符串
print(str.splitlines())  # 以 行(\r \n \r\n)为分隔符拆分字符串
print(" ".join(str))  # 以" "(空格)作为分隔符，将strongoing所有元素合并为一个新的字符串 
      
 
 
String operations on python

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