First commit of all the raw code for Learn Python3 THW.

Author: zedshaw

ex.py

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+# empty exercise

ex.sh

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+python ex.py

ex1.err

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+$ python3.6 python/ex1.py
+  File "python/ex1.py", line 3
+    print("I like typing this.
+                             ^
+SyntaxError: EOL while scanning string literal
+

ex1.py

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+print("Hello World!")
+print("Hello Again")
+print("I like typing this.")
+print("This is fun.")
+print('Yay! Printing.')
+print("I'd much rather you 'not'.")
+print('I "said" do not touch this.')

ex1.sh

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+python3.6 ex1.py

ex10.py

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+tabby_cat = "\tI'm tabbed in."
+persian_cat = "I'm split\non a line."
+backslash_cat = "I'm \\ a \\ cat."
+
+fat_cat = """
+I'll do a list:
+\t* Cat food
+\t* Fishies
+\t* Catnip\n\t* Grass
+"""
+
+print(tabby_cat)
+print(persian_cat)
+print(backslash_cat)
+print(fat_cat)

ex10.sh

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+python3.6 ex10.py

ex11.py

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+### @export "fake"
+import fake_input
+input, input = fake_input.create(['38', '6\'2"', '180lbs'])
+
+### @export "code"
+print("How old are you?", end=' ')
+age = input()
+print("How tall are you?", end=' ')
+height = input()
+print("How much do you weigh?", end=' ')
+weight = input()
+
+print(f"So, you're {age} old, {height} tall and {weight} heavy.")
+

ex11.sh

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+### @export "run"
+python3.6 ex11.py

ex12.py

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+### @export "fake"
+import fake_input
+input, input = fake_input.create(['38', '6\'2"', '180lbs'])
+
+### @export "code"
+age = input("How old are you? ")
+height = input("How tall are you? ")
+weight = input("How much do you weigh? ")
+
+print(f"So, you're {age} old, {height} tall and {weight} heavy.")
+

ex12.sh

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+python3.6 ex12.py

ex13.py

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+from sys import argv
+# read the WYSS section for how to run this
+script, first, second, third = argv
+
+print("The script is called:", script)
+print("Your first variable is:", first)
+print("Your second variable is:", second)
+print("Your third variable is:", third)
+

ex13.sh

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+### @export "first"
+python3.6 ex13.py first 2nd 3rd
+### @export "others"
+python3.6 ex13.py stuff things that
+
+python3.6 ex13.py apple orange grapefruit
+
+### @export "error"
+python3.6 ex13.py first 2nd

ex14.py

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+### @export "setup"
+import fake_input
+input, input = fake_input.create(['Yes',
+                                   "San Francisco",
+                                   'Tandy 1000'])
+
+### @export "code"
+from sys import argv
+
+script, user_name = argv
+prompt = '> '
+
+print(f"Hi {user_name}, I'm the {script} script.")
+print("I'd like to ask you a few questions.")
+print(f"Do you like me {user_name}?")
+likes = input(prompt)
+
+print(f"Where do you live {user_name}?")
+lives = input(prompt)
+
+print("What kind of computer do you have?")
+computer = input(prompt)
+
+print(f"""
+Alright, so you said {likes} about liking me.
+You live in {lives}.  Not sure where that is.
+And you have a {computer} computer.  Nice.
+""")
+

ex14.sh

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+python3.6 ex14.py zed

ex15.py

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+### @export "setup"
+import fake_input
+input, input = fake_input.create(['ex15_sample.txt'])
+
+### @export "code"
+from sys import argv
+
+script, filename = argv
+
+txt = open(filename)
+
+print(f"Here's your file {filename}:")
+print(txt.read())
+
+print("Type the filename again:")
+file_again = input("> ")
+
+txt_again = open(file_again)
+
+print(txt_again.read())
+
+

ex15.sh

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+python3.6 ex15.py ex15_sample.txt

ex15_sample.txt

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+This is stuff I typed into a file.
+It is really cool stuff.
+Lots and lots of fun to have in here.
+

ex16.py

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+### @export "setup"
+import fake_input
+input, input = fake_input.create(['', 'Mary had a little lamb',
+                                   'Its fleece was white as snow',
+                                   'It was also tasty'])
+
+### @export "code"
+from sys import argv
+
+script, filename = argv
+
+print(f"We're going to erase {filename}.")
+print("If you don't want that, hit CTRL-C (^C).")
+print("If you do want that, hit RETURN.")
+
+input("?")
+
+print("Opening the file...")
+target = open(filename, 'w')
+
+print("Truncating the file.  Goodbye!")
+target.truncate()
+
+print("Now I'm going to ask you for three lines.")
+
+line1 = input("line 1: ")
+line2 = input("line 2: ")
+line3 = input("line 3: ")
+
+print("I'm going to write these to the file.")
+
+target.write(line1)
+target.write("\n")
+target.write(line2)
+target.write("\n")
+target.write(line3)
+target.write("\n")
+
+print("And finally, we close it.")
+target.close()
+
+

ex16.sh

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+python3.6 ex16.py test.txt

ex17.py

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+### @export "fake"
+import fake_input
+input, input = fake_input.create([''])
+
+### @export "code"
+from sys import argv
+from os.path import exists
+
+script, from_file, to_file = argv
+
+print(f"Copying from {from_file} to {to_file}")
+
+# we could do these two on one line, how?
+in_file = open(from_file)
+indata = in_file.read()
+
+print(f"The input file is {len(indata)} bytes long")
+
+print(f"Does the output file exist? {exists(to_file)}")
+print("Ready, hit RETURN to continue, CTRL-C to abort.")
+input()
+
+out_file = open(to_file, 'w')
+out_file.write(indata)
+
+print("Alright, all done.")
+
+out_file.close()
+in_file.close()

ex17.sh

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+# first make a sample file
+echo "This is a test file." > test.txt
+# then look at it
+cat test.txt
+# now run our script on it
+python3.6 ex17.py test.txt new_file.txt

ex18.py

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+
+# this one is like your scripts with argv
+def print_two(*args):
+    arg1, arg2 = args
+    print(f"arg1: {arg1}, arg2: {arg2}")
+
+# ok, that *args is actually pointless, we can just do this
+def print_two_again(arg1, arg2):
+    print(f"arg1: {arg1}, arg2: {arg2}")
+
+# this just takes one argument
+def print_one(arg1):
+    print(f"arg1: {arg1}")
+
+# this one takes no arguments
+def print_none():
+    print("I got nothin'.")
+
+
+print_two("Zed","Shaw")
+print_two_again("Zed","Shaw")
+print_one("First!")
+print_none()
+
+

ex18.sh

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+python3.6 ex18.py

ex19.py

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+
+def cheese_and_crackers(cheese_count, boxes_of_crackers):
+    print(f"You have {cheese_count} cheeses!")
+    print(f"You have {boxes_of_crackers} boxes of crackers!")
+    print("Man that's enough for a party!")
+    print("Get a blanket.\n")
+
+
+print("We can just give the function numbers directly:")
+cheese_and_crackers(20, 30)
+
+
+print("OR, we can use variables from our script:")
+amount_of_cheese = 10
+amount_of_crackers = 50
+
+cheese_and_crackers(amount_of_cheese, amount_of_crackers)
+
+
+print("We can even do math inside too:")
+cheese_and_crackers(10 + 20, 5 + 6)
+
+
+print("And we can combine the two, variables and math:")
+cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)
+

ex19.sh

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+python3.6 ex19.py

ex2.py

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+# A comment, this is so you can read your program later.
+# Anything after the # is ignored by python.
+
+print("I could have code like this.") # and the comment after is ignored
+
+# You can also use a comment to "disable" or comment out a piece of code:
+# print("This won't run.")
+
+print("This will run.")
+

ex2.sh

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+python3.6 ex2.py

ex20.py

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+from sys import argv
+
+script, input_file = argv
+
+def print_all(f):
+    print(f.read())
+
+def rewind(f):
+    f.seek(0)
+
+def print_a_line(line_count, f):
+    print(line_count, f.readline())
+
+current_file = open(input_file)
+
+print("First let's print the whole file:\n")
+
+print_all(current_file)
+
+print("Now let's rewind, kind of like a tape.")
+
+rewind(current_file)
+
+print("Let's print three lines:")
+
+current_line = 1
+print_a_line(current_line, current_file)
+
+current_line = current_line + 1
+print_a_line(current_line, current_file)
+
+current_line = current_line + 1
+print_a_line(current_line, current_file)
+
+

ex20.sh

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+### @export "setup"
+echo "This is line 1" > test.txt
+echo "This is line 2" >> test.txt
+echo "This is line 3" >> test.txt
+### @export "run"
+python3.6 ex20.py test.txt

ex21.py

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+
+def add(a, b):
+    print(f"ADDING {a} + {b}")
+    return a + b
+
+def subtract(a, b):
+    print(f"SUBTRACTING {a} - {b}")
+    return a - b
+
+def multiply(a, b):
+    print(f"MULTIPLYING {a} * {b}")
+    return a * b
+
+def divide(a, b):
+    print(f"DIVIDING {a} / {b}")
+    return a / b
+
+
+print("Let's do some math with just functions!")
+
+age = add(30, 5)
+height = subtract(78, 4)
+weight = multiply(90, 2)
+iq = divide(100, 2)
+
+print(f"Age: {age}, Height: {height}, Weight: {weight}, IQ: {iq}")
+
+
+# A puzzle for the extra credit, type it in anyway.
+print("Here is a puzzle.")
+
+what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
+
+print("That becomes: ", what, "Can you do it by hand?")
+
+

ex21.sh

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+python3.6 ex21.py

ex22.py

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+# empty exercise

ex22.sh

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+python3.6 ex22.py

ex23.py

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+# empty exercise

ex23.sh

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+python3.6 ex23.py