Python Information Cheat Sheet:
1) python
–V or
python –version #This shows
the current installed python version.
2)
pip freeze will output a list of installed packages and their versions.
3) pip install django #This will install django framework.
pip
install django –upgrade #For Django upgrade.
4) Literal Constants - An example of a literal
constant is a number like
5, 1.23, 9.25e-3 or a string like 'This is a string' or "It's a string!".
It is called a literal because it is literal -
you use its value literally.
5) Numbers - In Python are of four types - integers,
long integers, floating point and complex numbers.
6) Strings - A string is a sequence of characters. Strings are basically just a bunch of words.
7) Variables - Their value can vary i.e.
you can store anything using a variable.
8) Identifier Naming - Variables are examples of
identifiers. Identifiers are
names given to identify something.
9) Data Types - Variables can hold values
of different types called data types. The basic types are numbers and strings.
10) Objects - Python refers to anything
used in a program as an object.
11) Logical and Physical Lines - A physical line is what
you see when
you write the program. A logical line is what Python sees as a single statement. Python
implicitly assumes that each physical line corresponds
to a logical line.
12) Indentation - Actually, whitespace at the beginning of the line is important. This is called indentation. Use a single tab.
13)
Operators - Operators are
functionality that do something and can be represented by symbols.
14)
Operator Precedence – PMDAS order by which
math operation executed.
15)
The if statement - The
if statement is used to
check a condition and if the
condition is true, we run a block of statements (called the if-block), else we
process another block of statements (called the else-block). The else clause
is optional.
16)
The while statement - The
while statement allows you to
repeatedly execute a block of statements as long as a condition is true. A while statement is an example
of what is called a looping statement.
A while statement can have an optional else clause.
17)
The for loop - The
for..in statement is another looping statement which iterates over a sequence of objects i.e. go
through each item in a sequence. break statement is used to break out of a loop statement i.e. stop the
execution of a looping statement, even if the loop condition has not become False or the sequence of items has been
completely iterated over. An important note is that if you break out of a for or while loop, any corresponding loop else block is not executed.
19)
The continue statement - The
continue statement is used to tell
Python to skip the rest of the statements in the current loop block and to continue to the next iteration of the loop.
GitHub:
https://github.com/bornfreesoul/Python/blob/master/BasicOne
