# Noemi Cabrera # 31 October 2021 # In this lesson, I learned to use the for..in loop with the range() function to perform # different operations and tasks. The range() function can have 1, 2, or 3 arguments. # If it has only 1 argument, it is the stop value and the start would be 0 by default. # If it has 2 arguments, then those are the start and stop values of the sequence. If it # has 3 arguments, those are the start value, stop value, and the step (skip) value. # I didn't have any difficulties in this lesson.

# [ In this code, the range function is used with a for.. in loop. In this case, the range # function takes the argument 10, which is the stop value of the sequence, and its # default start is 0. The final sequence is from integers 0 to 9.] review and run example for count in range(10): print(count)

# In this code, the range function with argument 10 is casted to a list and printed. The # for loop iterates throuugh each ite in the range function and prints them. # review and run example digits = range(10) print("digits =", list(digits), "\n") for count in digits: print(count)

# [ In this code, a sub_total variable is created with a value of 0. This variable is # later added with each item in the range 0 - 9. The different subtotals are printed. ] # review and run example sub_total = 0 for item in range(10): sub_total += item print("sub_total:", sub_total) print("Total =", sub_total)

# [ In this code, the variable hal_1 contains the lenght of the spell_list divided by two. # Then, this lenght is placed as the stop value in the range function, which prints the # items in the spell_list up to the half-lenght value, which is 3. ] # review and run example # print the first half of a spelling list spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] # find length of 1st half of list (must be int) half_1 = int(len(spell_list)/2) for word in range(half_1): print(spell_list[word])

# [ In this code, each number of the range 0 - 5 is printed because the stop value 6 is # not included. The argument is x since x cointains the stop value. Each item is printed.] # for x = 6, use range(x) to print the numbers 1 through 5 x = 6 for number in range(x): print(number)

# [ In this code, the for...in loop iterates through each item in the sequence of integers # generated by the range() function (with a start value of 1, a stop value of 8). Then each item is multiplied to get a total value. ] # using range(x) multiply the numbers 1 through 7 # 1x2x3x4x5x6x7= 5040 total = 1 for number in range(1,8): total *= number print(total)

# [ In this code, the second half of the spell list is printed. The range used in the # for loop is from 0 to 7. Snnce the middle of spell_list is 3, the words that are less # than the middle are not printed. However, teh words statrting from the middle until # the end are printed using an if/else statement. half and ends at the last item in the # last. Each word is written in a new line. ] # print the second half of a spelling list using a range(stop) loop to iterate the list spell_list = ["Wednesday", "Tuesday", "February", "November", "Annual", "Calendar", "Solstice"] half_2 = int(len(spell_list)/2) print("The second half starts at index",half_2) for word in range(7): if word < 3: pass else: print(spell_list[word])

# [ In this for..in loop, the range specifies the start value is 5 and the stop value is 9 # (10 is not included). Therefore, the numbers printed are 5 - 9. ] review and run example for count in range(5,10): print(count)

# [ In this code, the range starting at 5 and ending at 10 is used. Each of the integers # in range are added together continously to get a total value. In the for loop, the # sub_total variable adds the items and the temp variavble contains the value of # sub_total. ] review and run example sub_total = 0 temp = 0 for item in range(5, 11): temp = sub_total sub_total += item print("sub_total:", temp, "+", item, "=",sub_total) print("Total =", sub_total)

# [ In this code, the second half of the spell_list is printed by using a for..in loop. # The range() function has its start value at half of the spell list and a stop value of # the actual lenght of the spell_list. ] review and run example spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] # find length list spell_len = len(spell_list) # find lenght of 1st half (aka - start of 2nd half) half_1 = int(spell_len/2) # print 2nd half list for word in range(half_1,spell_len): print(spell_list[word])

# In this code, integers 5 - 15 are added to the five_fifteen list. The for loop iterates # through the integer sequence defined by range(5,16). Each of the integers are appended # to the five_fifteen list. # [ ] using range(start,stop), .append() the numbers 5 to 15 to the list: five_fifteen # [ ] print list five_fifteen five_fifteen = [] for number in range(5,16): five_fifteen.append(number) print(five_fifteen)

# [ The for loop iterates through the integer sequence defined by range(2,5). So this is # used to slice the spell_list and print the words that are located at index 2, 3, 4 ] # using range(start,stop) - print the 3rd, 4th and 5th words in spell_list # output should include "February", "November", "Annual" spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] for word in range(2,5): print(spell_list[word])

# In this code, the items at indexes 4 - 7 of the spell_list are printed. First, I found # the index of the item "Annual". Then, I used it in the range function to iterate and # print the items starting at "Annual" until the last item in spell_list. # [ ] using code find the index of "Annual" in spell_list # [ ] using range, print the spell_list including "Annual" to end of list spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] x = spell_list.index("Annual") for word in range(x,7): print(spell_list[word])

# [ In this code, the for...in loop iterates through the sequence of integers defined # by reange() that starts at 25, skips by 25, until it reaches 100 (101 not included)] # review and run example for count in range(25,101,25): print(count)

# [ In this code, the range starting at 25, skipping by 5, and ending at 5 is used. Each # of the integers in range are added together continously to get a total value. In the # for loop, thesub_total variable adds the items, and the temp variavble contains the # value of sub_total. ] review and run example sub_total = 0 temp = 0 for item in range(25,46,5): temp = sub_total sub_total += item print("sub_total:", temp, "+", item, "=",sub_total) print("Total =", sub_total)

# [ The for loop uses the range starting at 0, skypping by 2, and ending at the last # item of spell list to print each item of the last skipping by 2. ] # review and run example printing the 1st and then every other word in spell_list spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] for index in range(0,len(spell_list),2): print(spell_list[index])

# [The range starting at 1, skypping by 2, and ending at 19 is casted into a list and # assigned to the variable odd_list. The list is printed. ] # review and run example casting range to list odd_list = list(range(1,20,2)) print(odd_list)

# [ In this code, each integer in the range starting at 10, skipping by 2, and ending at # 20 is printed using a for..in loop. ] print numbers 10 to 20 by 2's using range for integer in range(10,21,2): print(integer)

# [ In this code, each integer in the range starting at 20 and ending at 10 is printed # using a for..in loop. The step is -1 because it reverses the order. The list starts at # 20 and ends at 10. ] print numbers 20 to 10 using range (need to countdown) # Hint: start at 20 for integer in range(20,9,-1): print(integer)

# [ Using the for..in loop, the words starting at index 0, skipping by 3, and ending at # the last item of spell_list is printed. Each word is printed in a new line. ] # print first and every third word in spell_list spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] for word in range(0, len(spell_list),3): print(spell_list[word])

# In this program, the user is asked to enter a word. Then with the for..in loop and # range() function the letters are sorted out into even and odd and placed into their # list. The .append() method is used to place the letters in the lists created. The range # for the odd letters starts at 0, skips by 2, and ends at the last letter of the word # entered. The range for the even letters starts at 1, skips by 2, and ends at the last # letter of the word entered. # [ ] complete List of letters program- test with the word "complexity" odd_letters = [] even_letters = [] word = input("Enter a word:") w_length = len(word) for odd in range(0, w_length, 2): odd_letters.append(word[odd]) for even in range(1, w_length, 2): even_letters.append(word[even]) print(odd_letters) print(even_letters)

# [ The error in this code was that the range function had square brackets instead of # parentheses. To fix this, I placed parentheses in the range function. ] # fix the error printing odd numbers 1 - 9 for num in range(1,10,2): print(num)