lecture2.py

import time
import random
# from <py file name> import <certain objects such as classes or functions>

# file = open('poem.txt', 'r')
# readFile = file.read()
# print(readFile)
# file.close()
#
# file = open('poem.txt', 'r')
# for line in file:
#     print(line)
# file.close()
#
# file = open('poem.txt', 'r')
# print(file.readline())
# print(file.readline())
# file.close()

file = open('poem.txt', 'r')
# print(file.readlines())
# readFile = file.readlines()
# # # I want to remove the '\n' at the end, how do I do this? .strip('\n')
# cleanFile = []
# for line in readFile:
#     cleanFile.append(line.rstrip())
# print(cleanFile)
file.close()

# file = open('poem.txt', 'w')
# newText = file.write('Oh, man. What an amazing poem.')
# print(newText)  # Will this print the file? No.
# file.close()
# file = open('poem.txt', 'r')
# print(file.read())  # Notice how it overwrote the file
# file.close()
#
# file = open('poem.txt', 'a')
# newText = file.write('Oh, man. What an amazing poem.')  # Notice how we used write() but it serves a different purpose
# file.close()
# file = open('poem.txt', 'r')
# print(file.read())
# file.close()

# Good Practice (when opening a file):
# with open('poem.txt') as f:
#     readFile = f.read()
# print(readFile)
# This automatically closes the file for you

# ASCII Table
# chara = chr(97)
# print(chara)
# print(ord(chara))
# Notice how related these two functions are. These can be used for decrypting messages for example.

# file = open('times1.txt', 'a')
# timeList = [time.perf_counter()]
# for i in range(100):
#     print(random.randint(0, 10))
#     timeList.append(time.perf_counter())
# for i in timeList:
#     file.write(str(i) + '\n')
# file.close()
#
# file = open('times2.txt', 'a')
# timeList = [time.perf_counter()]
# for i in range(100):
#     random.randint(0, 10)
#     for n in range(100):
#         random.randint(0, 10)
#         for j in range(100):
#             random.randint(0, 10)
#     timeList.append(time.perf_counter())
# for i in timeList:
#     file.write(str(i) + '\n')
# file.close()
# Can also make graphs using a very useful module: matplotlib: https://matplotlib.org/2.0.2/index.html

# # Source: https://stackabuse.com/python-nested-functions/
# Nested functions
# def function1(): # outer function
#     print ("Hello from outer function")
#     def function2(): # inner function
#         print ("Hello from inner function")
#     function2()
#
# function1()

# def num1(x):
#    def num2(y):
#       return x * y
#    return num2
# res = num1(10)
#
# print(res(5))

# # Source: https://www.w3schools.com/python/ref_keyword_nonlocal.asp
# def myfunc1():
#   x = "John"
#   def myfunc2():
#     nonlocal x
#     x = "hello"
#   myfunc2()
#   return x
#
# print(myfunc1())

# c = 1 # global variable
# def add():
#     return c + 10
#
# print(add())
#
# # Source: https://www.programiz.com/python-programming/global-keyword
# def foo():
#     x = 20
#
#     def bar():
#         global x
#         x = 25
#
#     print("Before calling bar:", x)
#     print("Calling bar now")
#     bar()
#     print("After calling bar:", x)
#
#
# foo()
# print("x in main:", x)
# #
# class Person():
#     def foo6(self):
#         print("I'm a thing.")
#
# A = Person()
# A.foo6()
#
# del Person
# B = Person()
# This will delete the object class Person