completed python challenge

main.py

@@ -1,37 +1,54 @@
 def hello_world():
     '''Prints "Hello World!".'''
+    print("Hello World!")
     return
 
 
 def sum(a, b):
     '''Accepts 2 numbers as parameters, returns sum of a and b.'''
-    return 0
+    return a + b
 
 
 def sub(a, b):
     '''Accepts 2 numbers as parameters, returns subtraction of a and b.'''
-    return 0
+    return a - b
 
 
 def product(a, b):
     '''Accepts 2 numbers as parameters, returns product of a and b.'''
     # CHALLENGE: use a for loop and your sum function to implement product
-    return 0
+    sumVal = 0
+    for i in range(a):
+        sumVal = sum(sumVal, b)
+    return sumVal
 
 
 def divide(a, b):
     '''Accepts 2 numbers as parameters, returns a divided by b.'''
     # only pass in numbers that are divisible for sake of implementation
     # CHALLENGE: use a while loop and your sub function to implement divide
-    return 0
+    ans = 0
+    while a > 0:
+        a = sub(a,b)
+        ans = ans + 1
+    return ans
 
 
 def root(num):
     '''Accepts a number as a parameter, returns the sqrt of num.'''
     # only pass in numbers that are perfect squares for sake of implementation
     # leetcode easy
     # CHALLENGE: do not use any built-in Python functions
-    return 0;
+
+    if num == 1 or num == 0:
+        return num
+
+    sum = 1
+    itr = 1
+    while sum < num:
+        itr += 1
+        sum = itr*itr
+    return itr
 
 
 def main():

main2.py

@@ -2,15 +2,37 @@ def oddOrEven(nums):
     '''Given an unsorted list of numbers, return a list that indicates if the value at each index is odd (0) or even (1).'''
     # EXAMPLE:
     # Given [2, 4, 5, 7, 8, 10], return [1, 1, 0, 0, 1, 1]
-    return []
+    list = []
+    for i in nums:
+        if i % 2 == 0:
+            list.append(1)
+        else:
+            list.append(0)
+    return list
 
 
 def mostOccurences(nums):
     '''Given an unsorted list of numbers, returns the value that occured the most in nums.'''
     # Hint: use oddOrEven to test function faster
     # Hint: use a map
     # Hint: https://stackoverflow.com/questions/13098638/how-to-iterate-over-the-elements-of-a-map-in-python
-    return -1 
+
+    dict_of_nums = {}
+
+    for i in nums:
+        if i in dict_of_nums:
+            dict_of_nums[i] += 1
+        else:
+            dict_of_nums[i] = 1
+
+    currMax = 0
+    maxValue = -1
+    for val in dict_of_nums:
+        if dict_of_nums[val] > currMax:
+            currMax = dict_of_nums[val]
+            maxValue = val
+
+    return maxValue
 
 
 def main():

main3.py

@@ -1,39 +1,65 @@
 #### INCLUDE ANY IMPORTS YOU NEED HERE, DO NOT PIP INSTALL ANY LIBRARIES ####
-
+import math
+import random
+import datetime
+import statistics
+import csv
 
 def perfect_square(num):
     '''Return the sqrt of <num> only if <num> is a perfect square, otherwise return -1.'''
     # Hint: math library
-    return 0
+
+    if num >= 0:
+        x = int(math.sqrt(num))
+        if (x*x == num):
+            return x
+
+    return -1
 
 
 def random_num_generator(min, max):
     '''Returns a random number between min and max inclusive.'''
     # Hint: random library
-    return 0
+    return random.randint(min, max)
 
 
 def get_today():
     '''Returns today's date in the format <month> <day>, <year> where month is a string, day & year are numbers.'''
     # Note: Code must work regardless of today's date
     # Example: November 19, 2021
     # Hint: datetime library
-    return "November 19, 2021"
+    x = datetime.datetime.now()
+    months = {1:"January", 2:"February", 3:"March", 4:"April", 5:"May", 6:"June", 
+              7:"July", 8:"August", 9:"September", 10:"October", 11:"November", 12:"December"}
+    return months[x.month] + " " + str(x.day) + ", " + str(x.year)
 
 
 def get_stat(nums, type):
     '''Returns <type> of an unsorted list <nums>, where type can be mean, median, mode.'''
     # Example: get_stat([0, 1, 2], "median"), returns 1
     # Hint: statistics library
-    return 0
+    if type == "mode":
+        return statistics.mode(nums)
+    elif type == "mean":
+        return statistics.mean(nums)
+    else:
+        return statistics.median(nums)
 
 
 def print_by_profit():
     '''Print data/sales_records.csv in order sorted by profit.'''
     # Hint: csv library
     # Hint: use built-in sort() after parsing csv
     # Hint: figure out how to print out each row in csv first
-    print("Working with csvs!")
+
+    with open("data/sales_records.csv") as f:
+        rows = list(csv.reader(f, delimiter=','))
+
+    rows.pop(0)
+    rows.sort(key=lambda i:float(i[13]))
+
+    for row in rows:
+        print(row)
 
 
 def main():