webinar-python-exam-review-2022-09-17

# Exam Review 2022 Sept 17

# LABS
# Ch 2-14... all Labs!
# Ch 21-33 just ADDITIONAL LABS, but important practice!
# Use Submit Mode!!!

# Watch your string input and output
# # 1
# myVar = input().strip() # myVar = input().rstrip()
# # 2
# print("some stuff", end=" ") # if you ever override end
# print() # print(end="\n")


# Comp 1: Basic syntax and knowledge: operators, data types, etc
# Comp 2: Control Flow
# Comp 3: Modules and Files

# Comp 1: Basic syntax and knowledge: operators, data types, etc
# Data Types
# int
# floats
# bool
# str # "" maybe the most important?
# list # [] probably the 2nd most important type
# dict # {key: value} also important
# set # {} all unique values, no order -> no index, can't slice
# tuple # () immutable... Python sees any x,y,z as (x,y,z)... return x,y-> return (x,y)

# operators
# = # assignment
# == # asking are these equal, comparison -> if/elif, while
# +
# -
# *
# /
# % # whole number remainder, how many WHOLE THINGS didn't fit?
# // # floor or integer division, last even division, int(x/y), math.floor(x/y)
# <
# >
# <=
# >=
# += # increment
# -= # decrement
# !=
# ** # raise to power... similar math.pow()
# # keywords
# in # if _someValue_ in _someContainer_
# not # flip around a Boolean --> if not _value_ in _someContainer_
# and
# or # any one True means whole condition is True... limit OR to 2 conditions

# Comp 2
# the HOW stuff... control flow structures
# IF statements... if, if/else, if/elif, if/elif/else...
# LOOPS
# WHILE - an IF that repeats
# FOR - looping over a container, or a known number of times... range()
# for _value_ in _container_:
# for item in myList:
# for n in range(0, 4): # [0, 1, 2, 3]
# for i in range(len(myList)) # myList[i]
# for key in myDictionary: # myDictionary[key]

# FUNCTIONS
# defining/writing vs calling
# parameters vs "outside" or "regular" variables
# parameters vs arguments
# a function has ONE particular job, modular
# return vs print()... write to a file?
# methods are functions that belong to a particular class or data type


# def someFunction(x, y):
#     return x + y
#
# if __name__ == "__main__":
#     myInput = int(input())
#     myOtherInput = int(input())
#     num = someFunction(myInput, myOtherInput)
#     print(num)

# See "tasks" in the last section of Ch 10, 11, 13, 14 for function writing practice
# CodingBat also has good function-based Python questions:
# https://codingbat.com/python

# BUILT-IN FUNCTIONS
# print()
# input()
# len()
# sum()
# min()
# max()
# range()
# list()
# dict()
# tuple()
# set()
# sorted() # compare to list.sort()
# reversed() # compare to list.reverse()
# round() # but it's cousins math.ceil() and math.floor() are in math module
# open() # IO/filename: .read(), .readlines(), .write()
#
# help()
# dir()
# # help(str)
# # print(dir(str))
# # help(str.isspace)
#
# for item in dir(dict):
#     if not item.startswith("__"):
#         print("{}()".format(item))

# STRINGS
# be able to slice like it's 2nd nature: myString[start:stop:step]
myString = "abc"
# revString = myString[::-1]
# print(revString)

# KNOW YOUR WHITESPACE
# " " # ... and a lot of other Unicode spaces
# \n
# \r
# \t
# \f

# STRING METHODS
# "stuff I want to {}".format(var) # or the similar f string
# myString.strip() # also .rstrip(), .lstrip()
# myString.split() # returns a list of strings
# ",".join(listOfStrings)
# myString.replace(oldSubStr, newSubStr) # remove... myString.replace(subStr, "")
# myString.find(subStr) # return index, or -1
# myString.count(subStr) # return number of occurences
# case: lower(), upper(), capitalize(), title()
# is/Boolean: isupper(), islower(), isalpha(), isdigit(), isalnum(), isspace()

# LISTS
# again, be able to slice

# LIST METHODS
# # +
# myList.append(item)
# myList.insert(i, item)
# myList.extend(anotherList)
# # -
# myList.pop(i) # pop by index...
# myList.remove(item) # remove by value
# # other
# myList.count(item)
# myList.sort()
# myList.reverse()
# # not so important
# myList.copy()
# myList.index(item)
# myList.clear()

# DICT
# use the key like an index
# myDict[key] # retrieve the value for that key, so like get()
# myDict[key] = value # assign (new) value for that key, so like update()
# myDict.items() # for k, v in myDict.items()... x, y = [2, 8]
# myDict.keys()
# myDict.values()

# SETS
# mySet.add(item)
# mySet.remove(item) # by value
# mySet.pop() # removes something random

# MODULES
# math and csv

# MATH MODULE
import math
# math.factorial(x)
# math.ceil(x.yz)
# math.floor(x.yz)
# math.pow(x, y) # similar to **, not to be confused with math.exp()
# math.sqrt()
# math.fabs() # abs()
# math.e
# math.pi

# different import types
# full import: import math
# partial import: from math import floor, from random import seed, randint, from math import *
# import as math as m

# import math
# math.factorial()

# from math import factorial
# --> factorial()

# from math import *
# --> factorial()

# import math as m
# --> m.factorial()

# # OPENING FILES
#  good practice in Ch 14 Task 4, 7, 8

# read!
with open("test.txt", "r") as f:
    contents = f.readlines() # a list of line by line strings
print(contents)
for line in contents:
    line = line.strip()
    print(line)

# read!
import csv
with open("mock_data.csv", "r") as f1:
    contents = list(csv.reader(f1)) # csv.reader(f1, delimiter="\t")

print(contents)

# write!
with open("output_data4.csv", "w") as f2:
    for line in contents:
        if line[3].endswith(".edu") or line[3].endswith(".org"): # if line[3][-3:] == "edu":
            # the write() method takes a SINGLE string as its arg
            f2.write(",".join(line) + "\n")

# append!
with open("append_to_this.txt", "a") as f3:
    f3.write("Pippin\n") # I had 2 line returns in the text file in Notepad !