# for loop review names = ['Joey', 'Leslie', 'Antonio'] # here 'names' is an iterable # here 'name' is the iteration variable for name in names: print(name)

# solution 1: using the end argument to print elements separated by comma for name in names[:-1]: print(name, end=', ') print(names[-1])

# solution 2: using string concatenation to print elements separated by comma result = "" # placeholder, an empty string for name in names[:-1]: result += name + ", " result += names[-1] print(result)

# here we have a list of words book_title = ['great', 'expectations','the', 'adventures', 'of', 'sherlock','holmes','the','great','gasby','hamlet','adventures','of','huckleberry','fin'] word_count = {} for word in book_title: if word not in word_count: word_count[word] = 1 else: word_count[word] += 1 print(word_count)

# here we have a list of words book_title = ['great', 'expectations','the', 'adventures', 'of', 'sherlock','holmes','the','great','gasby','hamlet','adventures','of','huckleberry','fin'] word_count = {} for word in book_title: word_count[word] = word_count.get(word, 0) + 1 print(word_count)

item_prices = [4, 11, 8, 5, 13, 2, 8, 10] items = [] while sum(items) < 20: print("Before adding: ", sum(items)) items.append(item_prices.pop()) print("After adding: ", sum(items))

print(items)

names = ['Joey', 'Leslie', 'Antonio'] for name in names: if name == 'Leslie': continue print(name)

names = ['Joey', 'Leslie', 'Antonio'] while len(names) > 0: name = names.pop() if name == 'Leslie': break print(name)

# we have a list of tuples # containing items and their weight in KGs cargo_items = [('bananas', 15), ('beds', 24), ('rice', 42), ('machine', 120), ('milk', 5)] # The maximum weight that your truck can take is 100 KG weight = 0 items = [] # iteration variable here is tuple unpacking for item_item, item_weight in cargo_items: if weight > 100: print("Truck weight is above 100 kg") break elif weight + item_weight > 100: print("Skipping {}".format(item_item)) continue else: print("Adding {} into the truck.".format(item_item)) weight += item_weight items.append(item_item) print("Final weight: ", weight) print("Final items: ", items)

%run -i students.py

# Exercise: find the nearest square number of an integer # A square number is the product of an integer multiplied by itself # for example 36 is a square number because it equals 6*6. # For example, if limit is 40, your code should set the nearest_square to 36. limit = 5 # TODO: find the largest square number less than the limit # Use a while loop integer = 1 while (integer + 1)**2 < limit: largest_square = (integer + 1)**2 integer += 1 print(largest_square)

# Exercise 2: Create a tag counter # You are given a list of tokens. tokens = ['<greeting>', 'Hello World!', '</greeting>', 'test', '<tst>'] # TASK: count how many of them are XML tags. # XML is a data language similar to HTML. # You can tell if a string is an XML tag if it begins with # a left angle bracket "<" and ends with a right angle bracket ">". count = 0 for token in tokens: if token[0] == "<" and token[-1] == ">": count += 1 print(count)