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Author: Svagtlys

ListComprehensions.py

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+# Let’s say I give you a list saved in a variable:
+#  a = [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
+# Write one line of Python that takes this list a and
+# makes a new list that has only the even elements of this list in it.
+
+a = [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
+
+# Here's my line
+result = a[1:len(a):2]
+# End my line, singular, only one
+
+#I was actually very confused by this prompt, as one could interpret it three ways.
+# 1. Even items in list (by testing)
+# 2. Even items in this list (odd indeces)
+# 3. Items at the even indeces (odd items in this list)
+
+# Okay, so I'm gonna test it with this bit down here, but it doesn't change anything.
+# I still only used one line
+print(a)
+print(result)

ListOverlapComprehensions.py

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+import random
+# Take two lists, say for example these two:
+#  a = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
+#  b = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
+# and write a program that returns a list that contains 
+# only the elements that are common between the lists 
+# (without duplicates). Make sure your program works on two 
+# lists of different sizes. Write this using at least one list comprehension.
+#Extra:
+# Randomly generate two lists to test this
+
+a = random.sample(range(30),random.randint(5,15))
+b = random.sample(range(30),random.randint(5,15))
+
+result = [item1 for item1 in a for item2 in b if item1 == item2]
+result2 = []
+
+for i in range(len(result)):
+    isfound = 0
+    for j in range(i+1, len(result)):
+        if result[i] == result[j]:
+            isfound = 1
+            break
+    if isfound == 0:
+        result2.append(result[i])
+
+print(result2)

StringLists.py

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+# Ask the user for a string and print out whether this string is a palindrome or not.
+# (A palindrome is a string that reads the same forwards and backwards.)
+
+string = input("Give me a word to test.\n")
+
+if string[0:int(len(string)/2)].lower() == string[len(string):int((len(string)-1)/2):-1].lower():
+    print(string + " is a palindrome.")
+else:
+    print(string + " is not a palindrome.")