Getting started with python

>>> 2+24>>> # This is a comment... 2+24>>> 2+2  # and a comment on the same line as code4>>> (50-5*6)/45.0>>> 8/5 # Fractions aren't lost when dividing integers1.6

To do integer division and get an integer result, discarding any fractional result, there is another operator ,//:

 

[Python]
>>># Integer division returns the floor:
... 7 // 3
2
>>> 7 //-3
-3

>>># Integer division returns the floor:
... 7 // 3
2
>>> 7 //-3
-3

Complex numbers are also supported; imaginary numbers are written with a suffix ofj orJ. complex numbers with a nonzero real component are written as (real + imagj), or can be created with thecomplex (real, imag) function.
 

[Python]
>>> 1j * 1J
(-1 + 0j)
>>> 1j * complex (0, 1)
(-1 + 0j)
>>> 3 + 1j * 3
(3 + 3j)
>>> (3 + 1j) * 3
(9 + 3j)
>>> (1 + 2j)/(1 + 1j)
(1.5 + J)

>>> 1j * 1J
(-1 + 0j)
>>> 1j * complex (0, 1)
(-1 + 0j)
>>> 3 + 1j * 3
(3 + 3j)
>>> (3 + 1j) * 3
(9 + 3j)
>>> (1 + 2j)/(1 + 1j)
(1.5 + J)

To extract these parts from a complex number z, usez. real andz. imag.

[Python]
>>> A = 1.5 + 0.5j
>>> A. real
1.5
>>> A. imag
0.5

>>> A = 1.5 + 0.5j
>>> A. real
1.5
>>> A. imag
0.5

The last printed expression is assigned to the variable _

[Python]
>>> Tax = 12.5/100
>>> Price = 100.50
>>> Price * tax
12.5625
>>> Price + _
113.0625
>>> Round (_, 2)
113.06

>>> Tax = 12.5/100
>>> Price = 100.50
>>> Price * tax
12.5625
>>> Price + _
113.0625
>>> Round (_, 2)
113.06

2: Strings
[Python]
> 'Spam eggs'
'Spam eggs'
>>> 'Doesn \ 't'
"Doesn' t"
>>> "Doesn' t"
"Doesn' t"
>>> '"Yes," he said .'
'"Yes," he said .'
>>> "\" Yes, \ "he said ."
'"Yes," he said .'
>>> '"Isn \' t," she said .'
'"Isn \'t," she said .'

>>> 'Spam eggs'
'Spam eggs'
>>> 'Doesn \ 't'
"Doesn' t"
>>> "Doesn' t"
"Doesn' t"
>>> '"Yes," he said .'
'"Yes," he said .'
>>> "\" Yes, \ "he said ."
'"Yes," he said .'
>>> '"Isn \' t," she said .'
'"Isn \'t," she said .'
Continuation lines can be used, with a backslash as the last character on the line indicating that the next line is a logical continuation of the line:

[Python]
>>> Hello = "this is not \ n \
Asdfasdf \ n \
Aksdfasd"
>>> Print (hello );

>>> Hello = "this is not \ n \
Asdfasdf \ n \
Aksdfasd"
>>> Print (hello); [python] view plaincopyprint? This is not
Asdfasdf
Aksdfasd

This is not
Asdfasdf
Aksdfasd

A "raw" string:

[Python]
>>> Hello = r "this is not \ n \
Asdfasdf \ n \
Aksdfasd"
>>> Print (hello );

>>> Hello = r "this is not \ n \
Asdfasdf \ n \
Aksdfasd"
>>> Print (hello); [python] view plaincopyprint? This is not \ n \
Asdfasdf \ n \
Aksdfasd

This is not \ n \
Asdfasdf \ n \
Aksdfasd

Strings can be concatenated (glued together) with the + operator, and repeated *:

[Python]
>>> Hello = 'hello ';
>>> World = 'World ';
>>> Hello = hello + world;
>>> Hello
'Helloworld'

>>> Hello = 'hello ';
>>> World = 'World ';
>>> Hello = hello + world;
>>> Hello
'Helloworld' [python] view plaincopyprint? >>> '<' + Hello * 5 + '>'
'<HelloWorldHelloWorldHelloWorldHelloWorldHelloWorld>'

>>> '<' + Hello * 5 + '>'
'<HelloWorldHelloWorldHelloWorldHelloWorldHelloWorld>'