Python small instance (1), python instance

Python small instance (1), python instance

1.

Question: There are four numbers: 1, 2, 3, and 4. How many three numbers can be composed of different and non-repeated numbers? What is each?

1 for i in range(1,5):2     for j in range(1,5):3         for k in range(1,5):4             if(i!=k)and(i!=j)and(j!=k):5                 print (i,j,k)

Function prototype: range (start, end, scan ):

Parameter description: start: the count starts from start. The default value is from 0. For example, range (5) is equivalent to range (0, 5 );

End: The end of the technology, but does not include end. For example, range (0, 5) is [0, 1, 2, 3, 4] No 5

Scan: interval of each hop. The default value is 1. For example, range (0, 5) is equivalent to range (0, 5, 1)

 

1 for I in range (5): 2 print (I) # Here I is from 0 to 4, the value of the following I + = 2 assignment statement is not changed. 3 I + = 2 4 print (I) 5 print ("end ")

Running result
Python test01.py
0
2
End
1
3
End
2
4
End
3
5
End
4
6
End

 

1 i=02 while i<5:3     print(i)4     i+=25     print(i)6     print("end")

Running result
Python test01.py
0
2
End
2
4
End
4
6
End

 

2.

Circular area

1 def area_circle(r):2     PI=3.143     return PI*r**24 5 print(area_circle(4))6 print(area_circle(7))7 print(area_circle(9))

 

3.

Calculate 1 to 100, (n ^ 2 + 1) n from 1 to 100

 1 def fun1(i): 2     return i 3  4 def fun2(i): 5     return i**2+1 6  7 def funt(start,end,fun): 8     sum=0 9     for i in range(start,end+1):10         sum+=fun(i)11     return sum12 13 print(funt(1,100,fun1))14 print(funt(1,100,fun2))