Getting started with Python second article

Day2

1. Pycharm Installation

#专业版

#no汉化版

2. Data type

Operator:

Arithmetic operations

1 # +    addition 2#  -    subtraction 3#  *    multiplication 4 # /    Division 5#  %    of the remainder of a divided by B 6#  * *    Power  7#  //    ask for an integer part of a divided by B

Comparison operation

1 #Note: The comparison operation results in a Boolean value (that is, True & False)2 #= = equals3 #> Greater than4 #< less than5 #>= greater than or equal to6 #<= less than or equal to7 # !=8 #<> Two is not equal to,! = is more commonly used

Assignment operations

1 #= equivalent, equal to equal sign2 #+ = C+=a equivalent to C = C + a3 #- = c-=a equivalent to C = c-a4 #*= c*=a equivalent to C = c * a5 #/= c/=a equivalent to C = c/a6 #%= c%=a equivalent to C = c% a7 #**= c**=a equivalent to C = c * * A8 #//= c//=a equivalent to C = c//a

Logical operation (with or not gate)

1 #and (with gate) or (or gate) not (non-gate)2 #If T is true,f to false3 #T and T = t T and F = f F and f = f4 #T or T = t t or F = t f or f = f5 #Not t = f not f = t6 7 #Note 1. In a long logical operation, add parentheses to the high-priority operation. 8 #Note 2. In the case of long logical operations, the parentheses are left-to-right according to the book sequence. Easy to use small tips see below9 " "Ten T or ==> result is t, end Operation One T and ==> continue operation A F or ==> continue operation - F and ==> result is f, end Operation - " "

Member operations

1 #example of member Operation2A1 ="Hello World"3 Print("ell" inchA1)#output is True4 Print("ELO" inchA1)#output to False5 Print("ell"  not inchA1)#output to False6 Print("ELO"  not inchA1)#output is True7 #In refers to whether a substring is a subset of a string, and if the output is true8 #not in refers to whether a substring is not a subset of the string, and if the output is true

3. Basic data types

　　　　　　

1 #Basic data Types2 #numeric (integer) int for example: 1234563 " "Py2, more than a certain size is divided into integer int and long integer type" "4 " "Py3, there is no integral type, it is int" "5 #string str For example ' Hello world '6 #List of lists for example7Name_list = ['Alex','Seven','Eric']8Name_list = List (['Alex','Seven','Eric'])9 #Ganso TupleTenages = (11, 22, 33, 44, 55) Oneages = tuple ((11, 22, 33, 44, 55)) A #Dictionary dict - " "dictionaries are unordered." " -person = {"name":"Mr.wu",' Age': 18} thePerson = Dict ({"name":"Mr.wu",' Age': 18}) - #Boolean value bool True or False

Getting started with Python second article