day 7 filter()

day7_filter_prime_numbers.py

@@ -0,0 +1,21 @@
+# Required concepts: https://www.w3schools.com/python/python_intro.asp map, filter, lambda
+
+print('Question: prime numbers in list,')
+
+def check_prime(num):
+  # note: you can end the for loop at √num
+  for i in range(2,num):
+    if num == 1:
+      return False
+    if num%i == 0:
+      # you found a factor of num!
+      return False
+  # you didn't find any multiple, you're prime
+  return True
+
+li = [2,3,4,5,6,7,8,9]
+print(li)
+
+primes = filter(check_prime,li)
+
+print(list(primes))

main.py

@@ -1,12 +1,20 @@
-# Required concepts: https://www.w3schools.com/python/python_intro.asp while loop and maths 
-print('Question: reverse number without using strings')
-
-def getReverse(num):
-  res = 0
-  while num > 0:
-    # take last digit and put in the front of res
-    digit = num%10
-    num //=10
-    res = res*10 + digit
-  return res
-print(getReverse(1234))
+# Required concepts: https://www.w3schools.com/python/python_intro.asp map, filter, lambda
+
+print('Question: prime numbers in list,')
+
+def check_prime(num):
+  for i in range(2,num):
+    if num == 1:
+      return False
+    if num%i == 0:
+      # you found a factor of num!
+      return False
+  # you didn't find any multiple, you're prime
+  return True
+
+li = [2,3,4,5,6,7,8,9]
+print(li)
+
+primes = filter(check_prime,li)
+
+print(list(primes))