2018-05-27--python Seventh Day

Set set: Unordered immutable values (numbers, characters, Ganso) made up of different elements (which are automatically de-weighed)

s = {1,2,3,4,5}

S=set (' Hello ')

Set.add (x)//add element x to set

Set.clear ()//condition Set

S=set.copy ()//

Set.pop ()//randomly delete an element?

Set.remove (x)//delete x element, x not present error

Set.discard ()//delete x element, x does not exist without error

(set&x==) set.intersection (x)//Take the intersection of X and set

(set|x==) Set.union ()//Take x and set of the set

(set-x==) Set.difference ()//Take the difference set of X and set

(set=set-x==) set.difference_update (x)//Take Set-x difference set and update set ... Several other calculations also have an update

(set^x) set.symmetric_difference (x)//Take x and set cross complement sets

Set.isdisjoint (X,x1 ... )//Determine if set and X have intersection, return BOOL. X can be multiple

Set.issubset (x,x1 ...) Determine if set is a subset of x?

Set.issuperset (x,x1 ...) Determine if x is a subset of set

Set.update (x)//update the value of set to the value of x, X is an iterative value of 4

S=frozenset ()//definition cannot become a collection

String formatting: Percent semicolon, format

\033[num;1m%[(name)][flags][width]. [Precision]type\033[0m

\033[NUM;1M: Add color

Name: Select the specified key

flags:+//right, positive before plus,-//left aligned, positive before unsigned, space//right-aligned, positive before plus space, 0//right-aligned, positive before unsigned

Width: Occupied precision: Number of digits after the decimal point

Type

• S, gets the return value of the __str__ method of the passed-in object and formats it to the specified location
• R, gets the return value of the __repr__ method of the passed-in object and formats it to the specified location
• C, Integer: Converts a number to its Unicode corresponding value, 10 binary range is 0 <= i <= 1114111 (py27 only supports 0-255); character: add character to specified position
• O, converts an integer to an octal representation and formats it to a specified location
• X, converts an integer to a hexadecimal representation and formats it to a specified location
• D, converts an integer, floating-point number to a decimal representation, and formats it to a specified position
• E, converting integers, floating-point numbers to scientific notation, and formatting them to a specified location (lowercase e)
• E, converting integers, floating-point numbers into scientific notation, and formatting them to a specified position (uppercase E)
• F, converts an integer, floating-point number to a floating-point number representation, and formats it to a specified position (the default is 6 digits after the decimal point)
• F, ibid.
• G, auto-adjust convert integers, floating-point numbers to floating-point or scientific notation (more than 6 digits in scientific notation), and format them to a specified location (if scientific counts are e;)
• G, auto-adjust convert integers, floating-point numbers to floating-point or scientific notation (more than 6 digits in scientific notation), and format them to a specified location (if scientific counts are e;)
• %, when there is a format flag in the string, a percent sign is required

msg= ' xxx%s sssss%s '% (' x1 ', ' x2 ')//or x is directly a variable name

msg= "Ssssss% (K1) s% (K2) d"%{"K1": "V1", "K2": "V2"}

Print (' x ', ' y ', ' z ', seq= ' n ')//seq use delimiter n

Format:

[[Fill]align] [Sign] [#] [0] [Width] [,] [. Precision] [Type]

• Fill "optional" white space filled with characters
• Align "optional" alignment (required with width)
• <, content left justified
• Content right-aligned (default)
• =, the content is right-aligned, the symbol is placed to the left of the padding character, and only valid for numeric types. Even: symbol + filler + number
• ^, content centered
• Sign "optional" with unsigned numbers
  • +, positive home Plus, minus plus negative;
  • -The plus sign does not change, minus is negative;
  • Spaces, plus spaces, minus signs and negative;
• # "optional" for binary, octal, hex, if added #, 0b/0o/0x is displayed, otherwise not displayed
• , "optional" adds a delimiter to the number, such as: 1,000,000
• width "Optional" format the size of the placeholder
• . Precision "optional" decimal digits reserved Precision
• type         "optional" format type
  • incoming parameter for string type
    • S, format string type data li>
    • blank, unspecified type, default is None, same as S
  • incoming parameter for integer type
    
    • B, 10 rounding The number is automatically converted to a 2 binary representation and then the
    • c is formatted, and the 10 binary integer is automatically converted to its corresponding Unicode character
    • d, decimal integer
    • o, 10 binary integers are automatically converted into 8 binary representations and then formatted;
    • x, which automatically converts 10 binary integers to 16 binary representations and then formats (lowercase x)
    • x, Converts a 10-decimal integer into a 16-binary representation and then formats (uppercase X)
  • incoming float or decimal type   parameter
    • E, converted to scientific notation (lowercase e) is represented, then formatted;
    • E, converted to scientific notation (capital E), and formatted;
    • F, converted to floating point (6 bits left after the default decimal point), and then formatted;
    • F, converted to floating point (6 bits left after the default decimal point), and then formatted;
    • g, automatically toggle between E and F
    • G, automatically toggle between E and F
    • %, display percent (6 digits after the decimal point by default)

tpl ="i am {}, age {}, {}".format(x1,x2，x3)//x可以是任意类型 , in order to take

tpl  = "i am {}, age {}, {}" . format ( * [ "seven" ,  18 ,  ‘alex‘ ])* Upload List tpl  = "i am {num}, age {num}, really {num}" . format ( "seven" ,  18 )//num索引位置 tpl  = "i am {0[0]}, age {0[1]}, really {0[2]}" . format ([ 1 ,  2 ,  3 ], [ 11 ,  22 ,  33 ]) tpl  = "i am {num}, age {num}, really {num}" . format ( * [ "seven" ,  18 ])//*传列表 tpl  = "i am {name}, age {age}, really {name}" . format (name = "seven" , age = 18 )Chuan Yuan zu tpl  = "i am {name}, age {age}, really {name}" . format ( * * { "name" :  "seven" ,  "age" :  18 })  //**传字典 tpl  = "i am {:s}, age {:d}, money {:f}" . format ( "seven" ,  18 ,  88888.1 )By type, in order tpl  = "i am {:s}, age {:d}" . format ( * [ "seven" ,  18 ]) tpl  = "i am {name:s}, age {age:d}" . format (name = "seven" , age = 18 ) tpl  = "i am {name:s}, age {age:d}" . format ( * * { "name" :  "seven" ,  "age" :  18 }) tpl  = "numbers: {:b},{:o},{:d},{:x},{:X}, {:%}" . format ( 15 ,  15 ,  15 ,  15 ,  15 ,  15.87623 ,  2 )//按顺序转换数字 tpl  = "numbers: {0:b},{0:o},{0:d},{0:x},{0:X}, {0:%}" . format ( 15 )//按索引转换数字 tpl  = "numbers: {num:b},{num:o},{num:d},{num:x},{num:X}, {num:%}" . format (num = 15 )

Function:

Definition method: def name (x):

.......

return x

() define the parameters in

Procedure: is a function that has no return value

Parameter: The variable used when defining the function, only the memory is allocated when the function is called, and then returned to the main function, no longer used

Arguments: Actual variables used in the main function

Local variables: Variables defined in a subroutine

Global variables: Variables defined at the beginning of the entire program

Suddenly found out that Alex big guy shared the nineth issue of video hhhhhh I'll see you today.

2018-05-27--python Seventh Day