Completed exercises

src/00_hello.py

@@ -1 +1,3 @@
-# Print "Hello, world!" to your terminal
+# Print "Hello, world!" to your terminal
+
+print('Hello, world!')

src/01_bignum.py

@@ -1,4 +1,6 @@
 # Print out 2 to the 65536 power
 # (try doing the same thing in the JS console and see what it outputs)
 
-# YOUR CODE HERE
+# YOUR CODE HERE
+
+print(2 ** 65536)

src/02_datatypes.py

@@ -15,7 +15,10 @@
 
 # YOUR CODE HERE
 
+print(x + int(y))
 
 # Write a print statement that combines x + y into the string value 57
 
-# YOUR CODE HERE
+# YOUR CODE HERE
+
+print(str(x) + y)

src/03_modules.py

@@ -11,21 +11,33 @@
 # Print out the command line arguments in sys.argv, one per line:
 # YOUR CODE HERE
 
+for arg in sys.argv:
+		print(arg)
+
 # Print out the OS platform you're using:
 # YOUR CODE HERE
 
+print(sys.platform)
+
 # Print out the version of Python you're using:
 # YOUR CODE HERE
 
+print(sys.version)
 
 import os
 # See the docs for the OS module: https://docs.python.org/3.7/library/os.html
 
 # Print the current process ID
 # YOUR CODE HERE
 
+print(os.getpid())
+
 # Print the current working directory (cwd):
 # YOUR CODE HERE
 
+print(os.getcwd())
+
 # Print out your machine's login name
 # YOUR CODE HERE
+
+print(os.getlogin())

src/04_printing.py

@@ -12,6 +12,12 @@
 # y, and z:
 # x is 10, y is 2.25, z is "I like turtles!"
 
+print('x is %i, y is %.2f, z is "%s"' % (x, y, z))
+
 # Use the 'format' string method to print the same thing
 
-# Finally, print the same thing using an f-string
+print('x is {0}, y is {1:.2f}, z is "{2}"'.format(x, y, z))
+
+# Finally, print the same thing using an f-string
+
+print(f'x is {x}, y is {round(y, 2)}, z is "{z}"')

src/05_lists.py

@@ -8,22 +8,35 @@
 
 # Change x so that it is [1, 2, 3, 4]
 # YOUR CODE HERE
+
+x.append(4)
 print(x)
 
 # Using y, change x so that it is [1, 2, 3, 4, 8, 9, 10]
 # YOUR CODE HERE
+
+x.extend(y)
 print(x)
 
 # Change x so that it is [1, 2, 3, 4, 9, 10]
 # YOUR CODE HERE
+
+x.remove(8)
 print(x)
 
 # Change x so that it is [1, 2, 3, 4, 9, 99, 10]
 # YOUR CODE HERE
+
+x.insert(len(x) - 1, 99)
 print(x)
 
 # Print the length of list x
 # YOUR CODE HERE
 
+print(len(x))
+
 # Print all the values in x multiplied by 1000
-# YOUR CODE HERE
+# YOUR CODE HERE
+
+for val in x:
+		print(val * 1000)

src/06_tuples.py

@@ -36,9 +36,13 @@ def dist(a, b):
 
 # YOUR CODE HERE
 
+def print_tuple(t):
+    for val in t:
+        print(val)
+
 t = (1, 2, 5, 7, 99)
 print_tuple(t)  # Prints 1 2 5 7 99, one per line
 
 # Declare a tuple of 1 element then print it
-u = (1)  # What needs to be added to make this work?
+u = (1,)  # What needs to be added to make this work?
 print_tuple(u)

src/07_slices.py

@@ -12,26 +12,26 @@
 a = [2, 4, 1, 7, 9, 6]
 
 # Output the second element: 4:
-print()
+print(a[1])
 
 # Output the second-to-last element: 9
-print()
+print(a[- 2])
 
 # Output the last three elements in the array: [7, 9, 6]
-print()
+print(a[- 3:])
 
 # Output the two middle elements in the array: [1, 7]
-print()
+print(a[2:4])
 
 # Output every element except the first one: [4, 1, 7, 9, 6]
-print()
+print(a[1:])
 
 # Output every element except the last one: [2, 4, 1, 7, 9]
-print()
+print(a[:-1])
 
 # For string s...
 
 s = "Hello, world!"
 
 # Output just the 8th-12th characters: "world"
-print()
+print(s[7:12])

src/08_comprehensions.py

@@ -11,14 +11,14 @@
 # Write a list comprehension to produce the array [1, 2, 3, 4, 5]
 
 y = []
-
+y = [x + 1 for x in range(5)]
 print (y)
 
 # Write a list comprehension to produce the cubes of the numbers 0-9:
 # [0, 1, 8, 27, 64, 125, 216, 343, 512, 729]
 
 y = []
-
+y = [x ** 3 for x in range(10)]
 print(y)
 
 # Write a list comprehension to produce the uppercase version of all the
@@ -27,7 +27,7 @@
 a = ["foo", "bar", "baz"]
 
 y = []
-
+y = [x.upper() for x in a]
 print(y)
 
 # Use a list comprehension to create a list containing only the _even_ elements
@@ -36,6 +36,6 @@
 x = input("Enter comma-separated numbers: ").split(',')
 
 # What do you need between the square brackets to make it work?
-y = []
+y = [i for i in x if int(i) % 2 == 0]
 
 print(y)

src/09_dictionaries.py

@@ -36,12 +36,24 @@
 # Add a new waypoint to the list
 # YOUR CODE HERE
 
+waypoints.append({"lat": 45, "lon": 32, "name": "a fourth place"})
+
+print(waypoints)
+
 # Modify the dictionary with name "a place" such that its longitude
 # value is -130 and change its name to "not a real place"
 # Note: It's okay to access the dictionary using bracket notation on the
 # waypoints list.
 
 # YOUR CODE HERE
 
+waypoints[0]["lon"] = -130
+waypoints[0]["name"] = "not a real place"
+
+print(waypoints)
+
 # Write a loop that prints out all the field values for all the waypoints
-# YOUR CODE HERE
+# YOUR CODE HERE
+
+for i in waypoints:
+    print(i.values())

src/10_functions.py

@@ -2,6 +2,10 @@
 
 # YOUR CODE HERE
 
+def is_even(num):
+	if num % 2 == 0:
+		return True
+
 # Read a number from the keyboard
 num = input("Enter a number: ")
 num = int(num)
@@ -10,3 +14,4 @@
 
 # YOUR CODE HERE
 
+print("Even!") if is_even(num) else print("Odd")

src/11_args.py

@@ -6,6 +6,9 @@
 
 # YOUR CODE HERE
 
+def f1(int1, int2):
+  return int1 + int2
+
 print(f1(1, 2))
 
 # Write a function f2 that takes any number of integer arguments and prints the
@@ -14,6 +17,9 @@
 
 # YOUR CODE HERE
 
+def f2(*nums):
+  return sum(nums)
+
 print(f2(1))                    # Should print 1
 print(f2(1, 3))                 # Should print 4
 print(f2(1, 4, -12))            # Should print -7
@@ -22,7 +28,7 @@
 a = [7, 6, 5, 4]
 
 # How do you have to modify the f2 call below to make this work?
-print(f2(a))    # Should print 22
+print(f2(*a))    # Should print 22
 
 # Write a function f3 that accepts either one or two arguments. If one argument,
 # it returns that value plus 1. If two arguments, it returns the sum of the
@@ -31,6 +37,9 @@
 
 # YOUR CODE HERE
 
+def f3(num1, num2 = 1):
+  return num1 + num2
+
 print(f3(1, 2))  # Should print 3
 print(f3(8))     # Should print 9
 
@@ -45,6 +54,10 @@
 
 # YOUR CODE HERE
 
+def f4(**args):
+  for key, value in args.items():
+    print(f"key: {key}, value: {value}")
+
 # Should print
 # key: a, value: 12
 # key: b, value: 30
@@ -62,4 +75,4 @@
 }
 
 # How do you have to modify the f4 call below to make this work?
-f4(d)
+f4(**d)

src/12_scopes.py

@@ -5,6 +5,7 @@
 x = 12
 
 def change_x():
+    global x
     x = 99
 
 change_x()
@@ -19,8 +20,9 @@ def outer():
     y = 120
 
     def inner():
+        nonlocal y
         y = 999
-
+        
     inner()
 
     # This prints 120. What do we have to change in inner() to get it to print

src/13_file_io.py

@@ -11,9 +11,16 @@
 
 # YOUR CODE HERE
 
+with open('foo.txt', 'r') as f:
+	data = f.read()
+	print(data)
+
 # Open up a file called "bar.txt" (which doesn't exist yet) for
 # writing. Write three lines of arbitrary content to that file,
 # then close the file. Open up "bar.txt" and inspect it to make
 # sure that it contains what you expect it to contain
 
-# YOUR CODE HERE
+# YOUR CODE HERE
+
+with open('bar.txt', 'w') as b:
+	b.write("Hello\nHello\nHello")

src/14_cal.py

@@ -29,4 +29,45 @@
 
 import sys
 import calendar
-from datetime import datetime
+from datetime import datetime
+
+def usage_statement():
+    return f"usage: {sys.argv[0]} [month] [year]"
+
+
+def month_is_valid(m):
+    if m <= 12 and m >= 1:
+        return True
+    else:
+        return False
+
+
+arg_len = len(sys.argv)
+
+if arg_len == 3:
+    month = int(sys.argv[1])
+    year = int(sys.argv[2])
+
+    if month_is_valid(month):
+        print(calendar.month(year, month, 3, 1))
+
+    else:
+        print(usage_statement())
+
+elif arg_len == 2:
+    month = int(sys.argv[1])
+    year = datetime.today().year
+
+    if month_is_valid(month):
+        print(calendar.month(year, month, 3, 1))
+    else:
+        print(usage_statement())
+
+elif arg_len == 1:
+    month = datetime.today().month
+    year = datetime.today().year
+
+    print(calendar.month(year, month, 3, 1))
+
+else:
+    print(usage_statement())