Link to the previous post : https://statinfer.com/104-1-1-introduction-to-python-and-ide-for-python/

We will be using Spyder as our python environment.

Spyder-Editor

This is where you write the code

To execute the code, select and hit Ctrl+Enter.
You can load old code files.
Code written in this editor is saved in .py format.
You can hit the tab button to see the autofill options on objects and function names.
You will be spending most of your time on editor.

Spyder-Console

This is where the code will be executed when you hit Ctrl+Enter in editor.
Helps us in code testing and debugging.
Helps us to avoid errors in the source code at the development phase itself.
Its usual practice to write a chuck of code in editor then execute it and see if it is working well or not.
You can toggle between Console and IPython Console.

Spyder – Variable explorer

Shows all the variables that are created in the current session.
Helps in physically checking the presence of objects that are created.
Shows a quick summary of type of object, size, length, sample values etc.,
We can run the code and see the objects getting created, also we can validate the data type and size of the object.

Basic Commands in Python

Before you code

Python is case sensitive.
Be careful while using the Variable names and Function names.
- Sales_data is not same as sales_data
- Print() is not same as print()

Basic Commands

In [1]:

571+95
19*17
print(57+39)
print(19*17)
print("Data Vedi")

# use hash(#) for comments
#Division example
34/56

96
323
Data Vedi

Out[1]:

0.6071428571428571

Basics-What an error looks like?

In [2]:

Print(600+900) 
#used Print() instead of print()
576-'96'

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-7-8cacbcbfb378> in <module>()
----> 1 Print(600+900)
      2 #used Print() instead of print()
      3 576-'96'
      4 

NameError: name 'Print' is not defined

Assigning and Naming convention

Assignment operator

‘=’ is the assignment operator

In [3]:

income=12000
income

Out[3]:

In [4 ]:

x=20
x

Out[4]:

In [3]:

y=30
z=x*y
z

Out[3]:

In [4]:

del x #deletes the variable

Printing

In [5]:

name="Jack"
name

Out[5]:

'Jack'

In [6]:

print(name)

Jack

Is there a difference between output of name and print(name)?

In [7]:

book_name="Practical business analytics \n using SAS"
book_name

Out[7]:

'Practical business analytics \n using SAS'

In [8]:

print(book_name)

Practical business analytics 
 using SAS

Naming convention

Must start with a letter (A-Z or a-z)
Can contain letters, digits (0-9), and/or underscore “_”

In [9]:

#Doesn't work
1x=20

  File "<ipython-input-21-fd484b8e1634>", line 2
    1x=20
     ^
SyntaxError: invalid syntax

In [10]:

#works
x1=20 
x1

Out[10]:

In [11]:

#Doesn't work
x.1=20 
x.1

  File "<ipython-input-23-6d3a7516bd8a>", line 2
    x.1=20
      ^
SyntaxError: invalid syntax

In [12]:

#works
x_1=20 
x_1

Out[24]:

The next post is about Python objects.
Link to the next post : https://statinfer.com/104-1-3-python-objects/

20th June 2017

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104.1.2 Python Environment

Easy to use Python environment.