table of Contents
C ++ programmers to learn Python
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Open a new pit hhh, to touch the game AI, learn the point Py, made a point of notes.
Chapter II. Variables and Data Types
1. Before comment statements with #:
#这是注释If an error after adding a comment on the increase at the beginning of a file
#coding:utf-8 2. Commonly used in sensitive functions:
- upper (): all uppercase
- lower (): all lowercase
- title (): capitalize the first letter
Such as:
print('am'.upper())Output: AM
Clear blank string functions:
- lstrip () - rstrip (): Clear the corresponding left / right blank
- strip (): Clear both sides of the blank
- lstrip () - rstrip (): Clear the corresponding left / right blank
+ Combined string, numeric string variable str (number), either by double quotes string '' can also be single quotes'
Such as:
print("He has "+str(10)+' apples.')Variable names can only contain letters, numbers, underscores, you can start with a letter and underline, can not start with a number, to avoid naming keyword
Chapter III. List
1. Brief List
Array-like, the content can be modified
names=['AM','Hong','ZL']
print(names) #['AM','Hong','ZL']
print(names[0]) #AM
print(names[-1]) #ZL
#从0递增为正序，以-1递减为逆序2. modify, add, insert, delete list elements
Games=['GTA','LOL','CS']
Games[0]='GTA5' #修改列表元素,['GTA5','LOL','CS']
Games.append('COC') #在列表末尾增加元素，['GTA5','LOL','CS','COC']
Games.insert(0,'WOW') #在列表第n处插入元素，['WOW','GTA5','LOL','CS','COC']
del Games[0] #直接删除列表第n个元素
game=Games.pop(3) #删除第n个元素并且返回值为该元素
Games.remove('CS') #删除在列表中第一个值为'xx'的元素Chapter 4 Operation list
1. traversal
Format: for + variable name + in + list + ':'
only the content inside the loop body indent
Prices=[1,2,3]
for Price in Prices:
print(Price)
print(Price*2)2. Create a list of values
range (x, n): x is generated from n-1 to the start up of a string of numbers
range (x, n, a) : x is generated from the start up to n-1, a size of the interval for the series of digits
min (list name), max (list name), sum (list name): can be used to quickly find or calculate numbers
Price=list(range(1,4)) #相当于[1,2,3]
#可用list将range生成的一串数字变成列表
Prices=[]
for value in range(1,4):
price=value**2
Prices.append(price)
Prices=[value**2 for value in range(1,4)]
#上面两个列表是一样的，只是后者采用了列表解析，使得步骤简化
3. Use the part of the list
Use slice: '(' name list + + [number_1: number_2] + ')' # replication list
- number_1 and number_2 not fill from the top of the list represent the beginning and the end of the last one
- number_1: start from the index of the number number_1
- number_2: Copy the following total number of number_2
Players=['AM','BM','CM','DM','EM']
New_Players=[]
print(Players[0:3])
print(Players[:3]) #均输出['AM','BM','CM']
print(Players[2:])
print(Players[-3:]) #均输出['CM','DM','EM']
print(Players[:])
print(Players) #均输出['AM','BM','CM','DM','EM']
New_Players=Players #使New_Players也指向Players的列表，二者指向同一个
New_Players=(Players[:]) #使New_Players指向一个和Players的列表一样的新列表，二者分别指向各自的
4. tuple
Format: name = List (list of elements ...)
Usage and a list of similar, but the difference is the tuple content is not modified and is in brackets
game=('GTA5','Gta6')
game[0]='GTA4' #修改元组，非法，会报错
game=('GTA6','Gta7') #直接给元组变量赋值，合法
print(game)The fifth chapter if statement
- if else conditional required plus rear end ':' will perform a colon, the following condition is satisfied when the code indented
- 'Else if' becomes in a python 'elif', else statements can be omitted, may also be multiple if statements without the other two
- '&&' and '||' respectively becomes in python 'and' and 'or', '==' and '! =' Remains
Players=['AM','BM','CM','DM','EM']
Players2=[]
if Players:
for player1 in Players:
if player1 == 'AM':
print(player1)
elif player1 == 'BM': #elif语句可以不止一条
print(player1)
else:
print(player1+'.')
if 'AM' in Players: #检测特定值在不在列表中
print('AM')
for player2 in Players:
if player2 not in Players2:
print(player2)
num1=12
num2=24
if num1==12 and num2==23: #and需要二者均成立，而该条件不为真
print('right1')
if num1==12 or num2==23: #or只需要二者中一者成立，则该条件为真
print('right2')