WK1 Day 2 - Intro to Python

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

@@ -14,8 +14,10 @@
 # Write a print statement that combines x + y into the integer value 12
 
 # 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

@@ -5,27 +5,36 @@
 level operating system functionality.
 """
 
+
+import os
 import sys
+
 # See docs for the sys module: https://docs.python.org/3.7/library/sys.html
 
 # Print out the command line arguments in sys.argv, one per line:
 # YOUR CODE HERE
+for a in sys.argv:
+    print(a)
 
 # 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

@@ -11,7 +11,10 @@
 # Using the printf operator (%), print the following feeding in the values of x,
 # y, and z:
 # x is 10, y is 2.25, z is "I like turtles!"
+print('x is %d, y is %.2f and z is "%s"' % (x, y, z))
 
 # Use the 'format' string method to print the same thing
+print('x is {:d}, y is {:.2f} and z is "{:s}"'.format(x, y, z))
 
-# Finally, print the same thing using an f-string
+# Finally, print the same thing using an f-string
+print(f'x is {x}, y is {y:.2f} and z is "{z}"')

src/05_lists.py

@@ -8,22 +8,30 @@
 
 # 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
+for n in y:
+    x.append(n)
 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(5, 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 a in x:
+    print(a*1000)

src/06_tuples.py

@@ -17,28 +17,33 @@
 
 import math
 
+
 def dist(a, b):
     """Compute the distance between two x,y points."""
     x0, y0 = a  # Destructuring assignment
     x1, y1 = b
 
     return math.sqrt((x1 - x0)**2 + (y1 - y0)**2)
 
+
 a = (2, 7)   # <-- x,y coordinates stored in tuples
 b = (-14, 72)
 
 # Prints "Distance is 66.94"
 print("Distance is: {:.2f}".format(dist(a, b)))
 
 
-
 # Write a function `print_tuple` that prints all the values in a tuple
 
 # YOUR CODE HERE
+def print_tuple(v):
+    for n in v:
+        print(n)
+
 
 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

@@ -1,7 +1,7 @@
 """
-Python exposes a terse and intuitive syntax for performing 
+Python exposes a terse and intuitive syntax for performing
 slicing on lists and strings. This makes it easy to reference
-only a portion of a list or string. 
+only a portion of a list or string.
 
 This Stack Overflow answer provides a brief but thorough
 overview: https://stackoverflow.com/a/509295
@@ -12,26 +12,27 @@
 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()
+l = int(len(a)/2)
+print(a[l-1:l+1])
 
 # Output every element except the first one: [4, 1, 7, 9, 6]
-print()
+print(a[1:len(a)])
 
 # 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 +11,16 @@
 # Write a list comprehension to produce the array [1, 2, 3, 4, 5]
 
 y = []
-
-print (y)
+for x in range(1, 6):
+    y.append(x)
+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 = []
-
+for x in range(10):
+    y.append(x**3)
 print(y)
 
 # Write a list comprehension to produce the uppercase version of all the
@@ -27,7 +29,8 @@
 a = ["foo", "bar", "baz"]
 
 y = []
-
+for w in a:
+    y.append(w.upper())
 print(y)
 
 # Use a list comprehension to create a list containing only the _even_ elements
@@ -37,5 +40,7 @@
 
 # What do you need between the square brackets to make it work?
 y = []
-
-print(y)
+for n in x:
+    if int(n) % 2 == 0:
+        y.append(int(n))
+print(y)

src/09_dictionaries.py

@@ -35,13 +35,23 @@
 
 # Add a new waypoint to the list
 # YOUR CODE HERE
+waypoints.append({
+    "lat": 55,
+    "lon": -120,
+    "name": "some random place"
+})
 
 # 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]['name'] = 'not a real place'
+waypoints[0]['lon'] = -130
 
 # Write a loop that prints out all the field values for all the waypoints
-# YOUR CODE HERE
+# YOUR CODE HERE
+for w in waypoints:
+    for v in w.values():
+        print(v)

src/10_functions.py

@@ -2,11 +2,20 @@
 
 # YOUR CODE HERE
 
+
+def is_even(n):
+    if n % 2 == 0:
+        return True
+
+
 # Read a number from the keyboard
 num = input("Enter a number: ")
 num = int(num)
 
 # Print out "Even!" if the number is even. Otherwise print "Odd"
 
 # YOUR CODE HERE
-
+if is_even(num):
+    print("Even!")
+else:
+    print("Odd!")

src/11_args.py

@@ -5,15 +5,23 @@
 # the sum. This is what you'd consider to be a regular, normal function.
 
 # YOUR CODE HERE
-
+def f1(x,y):
+    return x + y
 print(f1(1, 2))
 
 # Write a function f2 that takes any number of integer arguments and prints the
 # sum.
 # Note: Google for "python arbitrary arguments" and look for "*args"
 
 # YOUR CODE HERE
-
+def f2(*nums):
+    l = len(nums)
+    if l == 0:
+        return 'No numbers were provided.'
+    elif l == 1:
+        return nums[0]
+    else:
+        return sum(nums)
 print(f2(1))                    # Should print 1
 print(f2(1, 3))                 # Should print 4
 print(f2(1, 4, -12))            # Should print -7
@@ -22,15 +30,16 @@
 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[0], a[1], a[2], a[3]))    # 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
 # arguments.
 # Note: Google "python default arguments" for a hint.
 
 # YOUR CODE HERE
-
+def f3(m, n=1):
+    return m + n
 print(f3(1, 2))  # Should print 3
 print(f3(8))     # Should print 9
 
@@ -44,6 +53,9 @@
 # Note: Google "python keyword arguments".
 
 # YOUR CODE HERE
+def f4(**kwargs):
+    for k, v in kwargs.items():
+        print(f"{k} = {v}")
 
 # Should print
 # key: a, value: 12
@@ -62,4 +74,4 @@
 }
 
 # How do you have to modify the f4 call below to make this work?
-f4(d)
+f4(monster=d["monster"], hp=d["hp"])

src/12_scopes.py

@@ -5,6 +5,7 @@
 x = 12
 
 def change_x():
+    global x
     x = 99
 
 change_x()
@@ -19,7 +20,8 @@ def outer():
     y = 120
 
     def inner():
-        y = 999
+       nonlocal y
+       y = 999
 
     inner()
 

src/13_file_io.py

@@ -11,9 +11,20 @@
 
 # YOUR CODE HERE
 
+# import os
+# print(os.getcwd())
+with open('src\\foo.txt') as f:
+    file_data = f.read()
+    print(file_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('src\\bar.txt', 'w+') as g:
+  for i in range(3):
+    g.write("This is line %d\r\n" % (i+1))
+