- Interaction with the user
python3 in
python2 in
Nothing will raw_input user input are stored as a string type
name=raw_input('>>>>>>>>>>>>>>>>>>>>>>>>>>>>: ')
>>>:egon
>>> print(name)
egon
>>> print(name,type(name)
>>> ('egon', <type 'str'>)
name=raw_input('>>>>>>>>>>>>>>>>>>>>>>>>>>>>: ')
>>>:1231231231232
>>> print(name,type(name))
>>> ('1231231231232', <type 'str'>)
>>> name
>>> '1231231231232'
>>> name,type(name)
>>> ('1231231231232', <type 'str'>)
input the user must enter a specific data type, enter what type it into what type of deposit
>>> x=input("输入: ")
输入: egon
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1, in <module>
NameError: name 'egon' is not defined
>>> x=input("输入: ")
输入: 'egon'
>>> x,type(x)
('egon', <type 'str'>)
>>> x=input("输入: ")
输入: [1,2,3]
>>> x,type(x)
([1, 2, 3], <type 'list'>)
>>> y=raw_input('####: ')
####: [1,2,2,3]
>>>
>>> y,type(y)
('[1,2,2,3]', <type 'str'>)
- Formatted output
% D% s and
name = INPUT ( 'Please INPUT your username:')
Age = INPUT ( 'Please INPUT your Age:')
Print ( 'My name IS', name, 'My Age IS', Age)
Print ( 'My name IS% S , my age is% S '% (name, Age))
' ''
username my name is entered, my age is inputted age
'' '
Print (' my name is% S My Age iS% S '% ( 18 is, 'Egon'))
Print ( 'My name IS% S My Age IS% D'% ( 'Egon', 18 is))
Print ( 'My name IS% S My Age IS% S'% ( 'Egon', 18 is))
print ( 'my name is% s my Age iS S%'% ( 'Egon', [l, 2,3])) #% S may receive any type of value
print ( 'my name is% s my age is% d '% (' egon ',' xxx ')) #% d can receive the digital type
# Effect: recording qq, age, ID number and other information defined: my_qq_id = 1,025,100,056 # is equivalent to int = my_qq_id (1,025,100,056) Print (my_qq_id, type (my_qq_id)) wherein Python2 If the definition of an integer, will be divided into long integer and categories my_age = 22 is Print (type (my_age)) >>> int # int the else X = 12356788990023466666666788544243 Print (type (X)) >>> long # long
# Effect: accurate information recording slight height, weight, and so the number of shooting ring Def: my_weigh = 161.4 # is equivalent to int = my_weigh (161.4) Print (my_weigh, type (my_weigh))
# Effect: Record countries, provinces and cities of residence, Taobao shipping address and other information Def: My_hometown = ' Yangzhou ' Print (of the type (My_hometown)) # Note: 1 between strings can be summed Province = ' JiangSu ' City = ' of Yangzhou ' Print (Province + City) # 2. The string can be a digital operation Print (10 * ' of Yangzhou ' )
# Role: recording a plurality of key: value value, and is represented by mapping key and value, the key is in the form of name, value is the essence of its content. DEF: # Key may be a string type, value can be a string data type may be other types = China { ' Captial ' : ' Beijing ' , ' Population ' : ' 14 Billion ' , ' Full name ' : ' People Republic China of ' } Print (China [ ' Captial ' ]) # may represent a data type having a plurality of object characteristics, and it is possible to know the information corresponding to characteristics of a person, a country, a historical period so You may be used to indicate different types of data
# Role: recording in the same category multiple sets of data, a value which is easily removed, such as a permanent member of the United Nations mentioned may think of China, Russia, Britain, France, the United States Def: # comma plurality of sets of strings, and other data separated type, and the first number is 0 from the start of the call United_of_Nations = [ ' China ' , ' Russia ' , ' England ' , ' French ' , ' America ' ] Print (United_of_Nations [0]) # by superimposing [ ] for the list of in-depth data call
# Effect: Analyzing logic operation or the like is correct or not is determined directly by the Boolean logical operators but by Def: X = 29 <30 Print (X) Y = ' ZZC ' > ' pH ' # can also be used the comparison between the strings, beginning from the first character comparison, the same comparison skip next print (y)
- Basic operators
# Arithmetic RES =. 1 +. 3 Print (RES) Print (. 1 +. 3 ) Print (10 /. 3) # Results decimals portion Print (10 //. 3) # leaving only the integer part Print (10%. 3) # take the remainder Print (2 **. 3 ) # comparison operation: == => <> = <=! # knowledge of: # may compare the size between each digital Print (10>. 3 ) Print (10> 3.1 ) # and the string only You can compare the size of the character string (the character corresponding to the position according to the ASCII table to compare the reference) MSG1 = ' Hello ' Msg2 = ' Z ' Print (MSG1> Msg2) # A-Za-Z Print ( ' A ' > ' the Z ' ) Print ( ' the Z ' > ' the Y ' ) Print (len ( ' Hello ' )>. 3 ) Print ( ' A ' >. 3 ) # lists are only compared in magnitude with a listing (according to the value corresponding to the position of sequentially comparing the corresponding values of the position must be the same type) L1 = [l, 2,3 ] L2 = [10 ,] Print (L2> L1) L3 = [10, 2,' B ' ,. 3 ] L4 = [10,2, ' B ' , ' C ' ] Print (L3> L4) # assignment operator Age = 18 is # incremental assignment Age +. 1 = # Age Age +. 1 = Print (Age ) # chain assignment X = 100 Y = X Z = X X = Y = Z = 100 Print (ID (X), ID (Y), ID (Z)) # intersecting assignment m = 1000 n- = 2000 # TEMP = m # m = n- # TEMP = n- n-, m = m, n- Print (m, n-) # decompression assignment ual relations = [11,22,33,44,55 ,] MON1 = ual relations [0] MON2 = ual relations [. 1 ] MON3 = ual relations [2 ] MON4 = ual relations [. 3 ] MON5 = ual relations [. 4 ] MON1, MON2, MON3, MON4, MON5 = ual relations Print (MON1, MON2, MON3, MON4, MON5) # number of values must contain an equal sign and an equal sign right the number of variable names coincide left MON1, MON2, MON3, MON4, MON5, MON6 = ual relations MON1, MON2, MON3, MON4, = ual relations _ = 3333 Print (_) MON1, MON2, _, _, _=salaries # 下划线最终被赋值为55 mon1,mon2,*_=salaries print(mon1) print(mon2) salaries=[11,22,33,44,55,] first=salaries[0] last=salaries[4] first,_,_,_,last=salaries first,*_,last=salaries print(first) print(last)
- logic operation
20 is = Age Sex = ' FEMALE ' # logical operators # and: connecting the left and right two conditions, only the final result in the case where the two conditions are true only for the True Print (Age> 18 is and Age <26 is and Sex == ' FEMALE ' and . 1>. 3 ) # or: connecting the left and right conditions, whenever a condition is established for the final result True Print (. 1>. 3 or 2>. 4 or ' X ' == ' Y ' or . 1 ==. 1 ) # Not Print ( Not . 1>. 3 ) Print (not (1 > 3 or 2 > 4 or 'x' == 'y' or 1==1)) res=(3>4 and 4>3) or (1==3 and ('x' == 'x' or 3 >3)) print(res)