95 lines
2.0 KiB
Markdown
95 lines
2.0 KiB
Markdown
# Codecademy's Python 2 Course
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https://www.codecademy.com/courses/learn-python/lessons/python-syntax/
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It's gratis and accepts Python 3 syntax.
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# Object-oriented
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"The main goal of an object oriented language is to make code reusable – we do this through the use of classes and objects. If we want to design a new type of car, we can start with what they all have in common: wheels, seats, a frame. Now that we’ve determined what cars have in common, we can more easily implement any type of car we want by starting from that basic blueprint."
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https://discuss.codecademy.com/t/what-does-it-mean-that-python-is-an-object-oriented-language/297314
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# Errors (ex5)
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"Mismatched quotes will cause a SyntaxError'
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"SyntaxError: EOL while scanning a string literal"
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No quotes will cause a NameError (interprets strings as commands. )
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# Math (ex6)
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```
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mirthful_addition = 12381 + 91817
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amazing_subtraction = 981 - 312
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trippy_multiplication = 38 * 902
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happy_division = 540 / 45
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sassy_combinations = 129 * 1345 + 120 / 6 - 12
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```
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## Find the remainder of a number using %
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```
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is_this_number_odd = 15 % 2
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is_this_number_divisible_by_seven = 133 % 7
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```
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# Updating variables / operators.
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```
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sandwich_price += sales_tax
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```
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is the same as:
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```
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sandwich_price = sandwich_price + sales_tax
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```
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but is much shorter.
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## Comments
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Are indicated by # or """This is not for running"""
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# Numbers
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An integer is like `5`, a float is a number with a decimal point like `5.0`. They can also be in scientific notation like `2.3e7`
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To make sure math like `7/2` = `3.5` is correct is by inputting it into Python like `7./2.` or `float(7)/2`
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# Strings
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Multi-line strings are marked by ```"""Mulit-
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line
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strings"""```
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# Booleans (True/False)
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True = int(1)
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False = int(0)
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# Fun Projects
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Design a shop using Ex7 and Ex9 as a frame:
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7:
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```
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money_in_wallet = 40
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sandwich_price = 7.50
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sales_tax = .08 * sandwich_price
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sandwich_price += sales_tax
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money_in_wallet -= sandwich_price
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```
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9:
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```
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cucumbers = 1
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price_per_cucumber = 3.25
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total_cost = cucumbers * price_per_cucumber
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print(total_cost)
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```
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