Python Learning (iii)--string manipulation

# Manipulation of strings
# Features: Non-modifiable

name = ' Phoenix '
Print (Name.capitalize ()) # Capitalize first letter
# Show: Phoenix
Print (Name.casefold ()) # Uppercase Full Change lowercase
# Show: Phoenix
Print (Name.center (50, "*")) # output is centered in "Phoenix" and the other 50 characters are padded with "*"
# Display: *********************phoenix**********************
Print (Name.count (' Oen ') # Count of occurrences of "Oen"
# Display: 1
Print (Name.encode ()) # Encodes a string into bytes format
# show: B ' Phoenix '
Print (Name.endswith ("IX")) # to determine if the string ends with IX
# Display: Ture
Print ("Phoenix\ty". Expandtabs (12)) # convert \ t to how long spaces
# Display: Phoenix Y
Print (Name.find ("O")) # Find A, find return index, cannot find return-1
# Display: 2

# Format: Formatting

msg = "My name is {}, and ' age ' is {}." # by Location
Print (Msg.format ("Alex", 22))
# Display: My name is Alex, and the is 22.
msg = "My name is {1}, and ' age ' is {0}." # by serial number
Print (Msg.format ("Alex", 22))
# Display: My name is a, and age is Alex.
msg = "My name is {name}, and age is {age}." # by variable name
Print (Msg.format (age=22, name= "Alex"))
# Display: My name is Alex, and the is 22.

# Format_map:

Print ({' Age ': Msg.format_map, ' name ': ' Alex '}) # by Dictionary
# Display: My name is Alex, and the is 22.

Print (Msg.index ("a")) # returns the index of the string where A is located
# Display: 4
Print (' 9aA '. Isalnum ()) # to determine if a string is a number and a letter
# Display: True
Print (' 9 '. IsDigit ()) # to determine if a string is an integer
# Display: True
Print (Name.isnumeric ()) # detects if a string consists only of numbers
# Display: False
Print (Name.isprintable ()) # determines if the string is printable
# Display: True
Print (Name.isspace ()) # detects if a string consists only of spaces
# Display: False
Print (Name.istitle ()) # Determines if all the words in the string are spelled in uppercase, and the other letters are lowercase
# Display: False
Print (Name.isupper ()) # to determine if all the letters in the string are uppercase
# Display: False

Print ("|". Join ([' Alex ', ' Jack ', ' Rain ']) # concatenate the elements in the list into a new string with the specified characters
# Display: Alex|jack|rain

# Maketrans: The conversion table used to create a character map, the simplest way to invoke two parameters.
# The first argument is a string that represents the character that needs to be converted, and the second parameter is also the target of the string representation transformation.
# Note: The length of the two string must be the same for the one by one corresponding relationship.

Intab = "Aeiou"
Outtab = "12345"
# character:
Trantab = Str.maketrans (Intab, Outtab)
str = "This is string example .... WOW!!!"
Print (Str.translate (trantab))
# display: th3s 3s str3ng 2x1mp12 .... W4W!!!

Print (Msg.partition (' is ')) # used to split the string according to the specified delimiter
# Display: (' My Name ', ' is ', ' {name}, ' and '-age '}. ')

Print ("Alex Li, Chinese name is Lijie". Replace ("Li", "Li", 1)) # replaces the old (older string) in the string with the new character,
# If you specify a third parameter, Max, the replacement does not exceed Max times.
# Show: Alex LI, Chinese name is Lijie

Print (Msg.swapcase ()) # swaps the case of a string
# Display: MY NAME is {name}, and age is {age}.

Print (Msg.zfill (40)) # Returns a string of the specified length, the original string is right-aligned, the front padding 0
# Display: 00000my name is {name}, and age is {age}.

Print (Msg.ljust (40, "-")) # returns an original string left aligned and fills a new string of the specified length with a space. Returns the original string if the specified length is less than the length of the original string.
# Display: My name is {name}, and age is {age}.----

Print (Msg.rjust (40, "-")) # returns an original string right-aligned and fills a new string with a space of a specified length. Returns the original string if the specified length is less than the length of the original string.
# display:----My name is {name}, and ' age ' is {age}.

b= "ddefdsdff_ haha"
Print (B.isidentifier ()) # detects if a string can be used as a marker, that is, if a variable naming convention is met
# Display: True

Python Learning (iii)--string manipulation