Python Tutorial Note 3

1.python Numeric functions

CMP (x, y) if x < y returns-1 if x = = y returns 0 if x > y returns 1

Max (A, b,...) Returns the maximum value of a given parameter, which can be a sequence.

Min ()

MODF (x) returns the integer part and fractional part of X, the two-part numeric symbol is the same as x, and the integer part is represented by a floating-point type. Note: The math module needs to be imported

Random number function: Need to import random module

Random.choice (range (10)), randomly selects an integer from 0 to 9.

Ramdom.randrange ([start,] stop [,step])

Random.random () returns a randomly generated real number that is within the range of [0,1].

random. seed changes the values in seed seed seed of the random number generator, Random.random () The result of the output is not the same

The Random.shuffle (list) sorts all elements of the sequence randomly.

2.python string

Transfer character

\ line end indicates continuation character

\ nthe line break

\ r Enter

formatting strings

%s

%d

%u

String built-in functions

string.join (seq) 
 
 Str = ;=  ( "a"   "B" ,  "C"  # string sequence print Strjoin ( seq     

Str.  Split(str="", num=string.  Count(str))              

Str= "Line1-abcdef \nline2-abc \NLINE4-ABCD";Print Str. print Str. ( ", 1  ); 
 Result: [ ' line1-abcdef ' , ' LINE2-ABC ' ,  ' LINE4-ABCD ' ] [ ' line1-abcdef ' ,< Span class= "PLN" >  ' \nline2-abc \nline4-abcd ' ]                 
 
    

String.rstrip ([char]) defaults to removing spaces at the end of a string string.

3.python List

Python contains the following functions:

Serial Number	function
1	CMP (List1, List2) Compare two elements of a list
2	Len (list) Number of list elements
3	Max (list) Returns the maximum value of a list element
4	MIN (list) Returns the minimum value of a list element
5	List (seq) Convert a tuple to a list

Python contains the following methods:

Serial Number	Method
1	List.append (obj) Add a new object at the end of the list
2	List.count (obj) Count the number of occurrences of an element in a list
3	List.extend (seq) Append multiple values from another sequence at the end of the list (extend the original list with a new list)
4	List.index (obj) Find the index position of the first occurrence of a value from the list
5	List.insert (index, obj) Inserting an object into a list
6	List.pop (Obj=list[-1]) Removes an element from the list (the last element by default), and returns the value of the element
7	List.remove (obj) To remove the first occurrence of a value in a list
8	List.reverse () Reverse List of elements
9	List.sort ([func]) Sort the original list

Python Tutorial Note 3