Python语法简单学习记录

IF

 1 username = input("name:")
 2 password = input("password:")
 3 code="code"
 4 yourcode = input("code:")
 5 if yourcode==code :
 6     if username=="user" and password=="123":
 7         print("success")
 8     else:
 9         print("failure")
10 else:
11     print("error code")

WHILE

 1 #--------------------二位数组------------------------------
 2 #[[0, 1, 2, 3], [0, 1, 2, 3], [0, 1, 2, 3], [0, 1, 2, 3], [0, 1, 2, 3]]
 3 
 4 S = [
 5         ["Start"]
 6     ]
 7 row = 5
 8 column = 4
 9 a = 0
10 b = 0
11 
12 while a < row:
13     while b < column:
14         S[a].append(1)
15         S[a][b] = b
16         b = b + 1
17 
18     S[a].pop(b)
19     b = 0
20     S.append([0])
21     a = a+1
22 
23 S.pop(len(S)-1)
24 print(S)

 Comprehension

1 Matrix = [
2     [1, 2, 3],
3     [4, 5, 6],
4     [7, 8, 9]
5 ]
6 G = [sum(row) for row in Matrix]
7 print(G)

Dictionary 

 1 Dict = {"food": "spam", "quantity": 4, "color": "pink"}
 2 print(Dict["food"])
 3 Dict["food"]+=",salad"
 4 print(Dict["food"])
 5 
 6 #字典嵌套字典
 7 Record = {"name": {"first": "Bob", "last": "smith"},
 8           "jobs": ["dev","mgr"],
 9           "age": 40}
10 print(Record["name"])
11 print(Record["name"]["last"])
12 Record["jobs"].append("janitor")
13 print(Record)

 

posted @ 2020-12-15 19:03  Σωκράτης  阅读(115)  评论(0)    收藏  举报