# Python Fundamentals

*Note: This lesson was written using Python 2.xx. If you are using Python 3.xxx any changes to the code will be annotated under headings: Python 3.xxx

Open up a new Jupyter Notebook. Remember, when working with Jupyter Notebooks, you need to hit Shift+Enter to execute your code. ## Arithmetic Operators

Python Arithmetic Operators are pretty standard. Take note of the division problem in line . 10/7 is not 1, but by default Python only shows integer answers You can work around it by defining the first number as a float() ### Python 3.xxx

Python 3 handles division differently.  To get integer numbers only in division, use //.

```10//7
1```
```10/7
1.4285714285714286```

## Arithmetic Operators

• – : Subtraction
• * : Multiplication
• / : Division
• % : Modulus (returns the remainder of a division problem: 5%2=1)
• ** : Exponent (4**2 = 16)

## Variables

Variables in Python are pretty straight forward. Unlike other programming languages, you do not need to define the variables first. Python dynamically assigns the data type.

Three main rules:

• Variables are case sensitive
• Avoid using command keywords (print, def, for) notice lowercase ‘a‘ returns an error

Remember, Jupyter notebooks only return the last command. If you want both variables, use the print command ### Python 3.xxx

In Python 3, print statements require ().

```print (A)
print (B)```

You can perform arithmetic functions on variables ### Python 3.xxx

`print (C)`

And of course, variables can hold strings as well as numbers ### Python 3.xxx

```print (E)
print (F)```

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