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@@ -53,124 +53,5 @@ Python has an array of frameworks for developing websites. The popular framewor
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* path?
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* In order to execute these files( javac java python (command names)), it must locate these files in path environment variables
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## Variables
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* Variables are containers for storing data values.
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* Unlike other programming languages, Python has no command for declaring a variable.
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* A variable is created the moment you first assign a value to it
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Example :
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```python
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x =1234
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y ="Aman"
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print(x)
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print(y)
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```
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Variables do not need to be declared with any particular type and can even change type after they have been set.
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```
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x = 78
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x = "Illona"
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print(x)
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```
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String variables can be declared either by using single or double quotes:
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```
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x = "Aman" // is the same as
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x = 'Aman'
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```
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_Variable Names_
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A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume). Rules for Python variables:
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* A variable name must start with a letter or the underscore character
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* A variable name cannot start with a number
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* A variable name can only contain alpha-numeric characters and underscores (A-z,0-9,and _)
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* Variable names are case-sensitive (age, Age and AGE are three different variables)
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_Assign Value to Multiple Variables_
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Python allows you to assign values to multiple variables in one line:
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Example
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```
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x, y, z = "X", "Y", 5
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print(x)
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print(y)
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print(z)
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```
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And you can assign the same value to multiple variables in one line:
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```
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Example
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x = y = z = "O"
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print(x)
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print(y)
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print(z)
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```
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The Python print statement is often used to output variables.
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* To combine both text and a variable, Python uses the + character:
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```
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x = "A"
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print("Python is " + x)
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```
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* You can also use the + character to add a variable to another variable:
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```
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x = "life is "
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y = "awesome"
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z = x + y
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print(z)
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```
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* For numbers, the + character works as a mathematical operator:
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```
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x = 78
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y = 98
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print(x + y)
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```
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* If you try to combine a string and a number, Python will give you an error:
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```
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x = 20
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y = "Aman"
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print(x + y)
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```
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## Global Variables
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A variable declared outside of the function or in global scope is known as global variable. This means, global variable can be accessed inside or outside of the function.
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```
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x = "aman"
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def func():
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print("Python is " + x)
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func()
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```
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## Standard data types
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Built-in Data Types
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In programming, data type is an important concept.
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Variables can store data of different types, and different types can do different things.
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Python has the following data types built-in by default, in these categories:
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