Basic Python knowledge

Numbers and expressions

[Python]
>>> 2 + 3
5
>>> 1.0/2.0
0.5
>>> 1.0 // 2.0 #//
0.0
>>> 1% 2 # % understanding
1
>>> 1/2 #/understanding
0
>>> 2 ** 3
8
>>>-2 ** 3
-8
>>> (-2) ** 3
-8
>>> (-2) ** 2
4

>>> 2 + 3
5
>>> 1.0/2.0
0.5
>>> 1.0 // 2.0 #//
0.0
>>> 1% 2 # % understanding
1
>>> 1/2 #/understanding
0
>>> 2 ** 3
8
>>>-2 ** 3
-8
>>> (-2) ** 3
-8
>>> (-2) ** 2
4
Long Integer
Python can handle very large integer types:

[Python]
>>> 10000004040404040679
2017004040404040679l

>>> 10000004040404040679
2017004040404040679l:

[Python] view plaincopyprint?
>>> 10000006044545*123434958906807 + 2897898
1234350335176233855348615713l

>>> 10000006044545*123434958906807 + 2897898
1234350335176233855348615713l
Hexadecimal and octal

[Python]
>>> 0xAF
175
>>> 0127
87
>>> 0xaf+ 0127
262

>>> 0xAF
175
>>> 0127
87
>>> 0xaf+ 0127
262
Variable
The variables in python are easy to understand. A variable is basically the name of a value. For example, if x represents 3, you only need the following statement:

[Python]
>>> X = 3

>>> X = 3 after the variable is assigned a value, you can use the variable in the expression.

[Python]
>>> X * 3
9

>>> X * 3
9
Statement
The following statement:

[Python]
>>> 2*3
6
>>> Print 2*3
6

>>> 2*3
6
>>> Print 2*3
6
Get user input

[Python]
>>> Input ("The meaning of Life :")
The meaning of Life: 104
104

>>> Input ("The meaning of Life :")
The meaning of Life: 104
104 here, this example is not very useful, but proceed with the following content:
[Python]
>>> X = input ("x :")
X: 289
>>> Y = input ("y :")
Y: 237
>>> Print x * y
68493

>>> X = input ("x :")
X: 289
>>> Y = input ("y :")
Y: 237
>>> Print x * y
68493
Function

[Python]
>>> 2 ** 3
8
>>> Pow (2, 3)
8

>>> 2 ** 3
8
>>> Pow (2, 3)
8. complex expressions:

[Python]
>>> 10 + pow (2, 3*13)/3.0
183251937972.66666

>>> 10 + pow (2, 3*13)/3.0
Module 183251937972.66666
You can think of a module as importing it to Python to enhance its functionality. Use special commands to import modules. The floor function mentioned above is in the module named math:

[Python]
>>> Import math
>>> Math. floor (20.8)
20.0

>>> Import math
>>> Math. floor (20.8)
20.0 if you want to convert to an integer, you can use the int function:
[Python]
>>> Int (math. floor (20.8 ))
20

>>> Int (math. floor (20.8 ))
20 another form of using the import command:

[Python]
>>> From math import sqrt
>>> Sqrt (20)
4.47213595499958