init

Author: AgarwalPragy

README.md

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+- [Lecture 1](/lecture1.md)

lecture1.md

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+
+Installation
+------------
+
+- download from https://www.python.org/
+- instructions https://realpython.com/installing-python/
+- linux:
+	```bash
+	sudo apt-get update
+	sudo apt-get install python3.8 python3-pip
+	sudo apt-get install python3-virtualenv
+	```
+- for now, use repl.it
+
+Python
+---------
+
+- Programming language
+- General purpose
+- Very high level
+- Simple, easy to learn, but powerful
+- Dynamically typed, but strongly typed (has static type checkers)
+- Multi paradigm - supports OOP, functional, procedural, Async
+- Excellent tooling - Pycharm, extensions for all major editors, flake8, pylint, black, mypy
+- Mature and extensive ecosystem
+- Seen mostly in
+	- Web Development - django, flask
+	- Data Analytics and Machine Learning - numpy, scipy, matplotlib, sklearn, ternsorflow, torch, pandas
+	- DevOps & Scripting
+	- Distributed Computing - pyspark, dask
+- Awesome-Python: [https://github.com/vinta/awesome-python](https://github.com/vinta/awesome-python)
+
+# Basics
+```py
+2 + 2 * 2 - 2 / 2 // 2 ** 2
+10 / 3
+10 // 3
+5 ** 5
+(-1) ** (1/2)
+```
+
+```py
+width = 20
+height = 50
+area = width * height
+_
+x
+```
+
+```py
+'hello, world'
+# escaping special chars, triple quoted, double quoted, f-strings, byte-strings
+# comments
+```
+
+```py
+print('Hello, World!')
+x = int(input('Enter number'))
+```
+
+
+```py
+x = int(input('Enter number'))
+y = int(input('Enter number'))
+operator = input('Enter operator')
+operator = operator.strip().lower()
+if operator == 'add':
+    print(f'{x} + {y} = {x+y}')
+elif operator == 'power':
+    print(f'{x} ^ {y} = {x ** y}')
+else:
+    print('I don\'t know what to do')
+```
+
+```py
+classes = ['ds-algo', 'python', 'machine-learning', 'ama']
+for c in classes:
+	print(c, len(c), c.upper(), c.lower())
+
+# can't use class as a variable name, because it is a keyword
+import keyword
+keyword.kwlist
+```
+
+```py
+for i in range(10):
+	print(f'Square of {i} is {i**2}')
+```
+
+```py
+range(10)
+range(1, 10)
+range(1, 10, -1)
+```
+
+```py
+classes = ['ds-algo', 'python', 'machine-learning', 'ama']
+for index, c in enumerate(classes):
+	print(index, c, len(c), c.upper(), c.lower())
+```
+
+```py
+sum(range(1000))
+list(range(1000))
+```
+
+```py
+while True:
+	pass
+
+i = 0
+while i < 10:
+	print(i)
+	i += 1
+```
+
+```py
+def foo():
+	pass
+
+def fib(n):
+	if n <= 1: return n
+	return fib(n-1) + fib(n-2)
+
+from functools import lru_cache
+
+help()
+dir()
+a, b = b, a
+snake_case
+collections.Counter
+import math
+math.pi
+math.e
+```
+