# Zhi Yuan "Oscar" Lin # 26 October 2021 # In this lesson, I learned more concerning the use of the range() function through examples and tasks. Additionally, # I learned how to use the range() function with the for...in loop. Furthermore, through trials and errors, I learned how # important it is to remember the format for the start, stop, and step value when using the range() function. # There were no major problems or questions throughout this lesson.

# [ ] review and run example # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 0, a stop # value of 10, and a step value of 1), is iterated and displayed on separate lines in the output one at a time. This loop # will continue until each element generated by the range() function is iterated. for count in range(10): print(count)

# review and run example # The variable "digits" is assigned to the sequence of integers, 1-9, generated by the range() function. digits = range(10) # This function displays the string "digits =" and the value assigned to the digits variable as a list, by using the list() # function, in the output. Additionally, a blank line will be displayed on the next line of the output due to the escape # character "\n". print("digits =", list(digits), "\n") # By using the for...in loop, each integer in the value assigned to the digits variable is iterated and display on different # lines in the output one at a time. This loop will continue until each element in the value assigned to the digit variable # is iterated. for count in digits: print(count)

# [ ] review and run example # The variable "sub_total" is assigned to the integer "0". sub_total = 0 # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 0, stop value # of 10, and step value of 1), is iterated and added to the value assigned to the sub_total variable. Subsequently, that # sum will be reassign to the sub_total variable. Additionally, the string "sub_total:" and the value assigned to the # sub_total variable will be display in the output. This loop will continue until each element in the value assigned to # the item variable is iterated. for item in range(10): sub_total += item print("sub_total:", sub_total) # This function displays the string "Total =" and the value assigned to the sub_total variable. print("Total =", sub_total)

# [ ] review and run example # print the first half of a spelling list # The variable "spell_list" is assigned to a list of strings. spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] # find length of 1st half of list (must be int) # The variable "half_1" is assigned to the value of the given value, when the string method "len()" determines the length # of the value assigned to the spell_list variable, being divided by the integer "2", and converted into an integer due # them being within the parentheses of the int() function. half_1 = int(len(spell_list)/2) # By using the for...in loop, a sequence of integers generated by the range() function with the arugment of the half_1 # variable (with a start value of 0, a stop value of 3, and a step value of 1), is iterated. Subsequently, the value # assigned to the word variable will serve as the index position for the spell_list variable, and be display the value in # that index position in the value assigned to the spell_list variable in the output. This loop will continue until each # element generated by the range() function is iterated. for word in range(half_1): print(spell_list[word])

# [ ] for x = 6, use range(x) to print the numbers 1 through 6 # The variable "x" is assigned to the integer "6". x = 6 # By using the for...in loop, a sequence of integers generated by the range() function with the arugment of the x variable # (with a start value of 0, a stop value of 6, and a step value of 1), is iterated and added to the integer "1". # Subsequently, that sum will be assigned to the count variable. Additionally, the value assigned to the count variable # will be display in the output. This loop will continue until each element generated by the range() function is iterated. for count in range(x): count += 1 print(count)

# [ ] using range(x) multiply the numbers 1 through 7 # 1x2x3x4x5x6x7 = 5040 # The variable "t" is assigned to the integer 1. t = 1 # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 1, a stop # value of 8, and a step value of 1), is iterated and multiplied to the value assigned to the t variable. Subsequently, that # product will be reassign to the t variable. This loop will continue until each element generated by the range() function # is iterated. for count in range(1,8): t = t * count # This function displays the value assigned to the t variable in the output. print(t)

# [ ] print the second half of a spelling list using a range(stop) loop to iterate the list # The variable "spell_list" is assigned to a list of strings. spell_list = ["Wednesday", "Tuesday", "February", "November", "Annual", "Calendar", "Solstice"] # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 0, a stop # value of 7, and a step value of 1), is iterated and determined by an IF statement. The IF statement determines if the # value assigned word variable is less than the integer "3". If true, nothing will be execute due to the keyword "pass". # If false, the program moves on to the else statement with the value assigned to the word variable serving as the index # position for the spell_list variable. Consequently, the value in that index position in the value assigned to the # spell_list variable will be display in the output. This loop will continue until each element generated by the range() # function is iterated. for word in range(7): if word < 3: pass else: print(spell_list[word])

# [ ] review and run example # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 5, a stop # value of 10, and a step value of 1), is iterated and displayed on separate lines in the output one at a time. This loop # will continue until each element generated by the range() function is iterated. for count in range(5,10): print(count)

# [ ] review and run example # The variable "sub_total" is assigned to the integer "0". sub_total = 0 # The variable "temp" is assigned to the integer "0". temp = 0 # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 5, a stop # value of 11, and a step value of 1), is iterated. Subsequently, the value assigned to the sub_total variable is assign # to the temp variable. Following that, the sub_total variable is reassigned to the value assigned to the sub_total # variable added to the value assigned to the item variable. Additionally, the string "sub_total", the value assigned to # the temp variable, the string "=" the value assigned to the item variable, the string "=", and the variable assigned to # the sub_total variable, will be display in the output. This loop will continue until each element generated by the range() # function is iterated. for item in range(5, 11): temp = sub_total sub_total += item print("sub_total:", temp, "+", item, "=",sub_total) # This function displays the string "Total =" and the value assigned to the sub_total variable in the output. print("Total =", sub_total)

# [ ] review and run example # The varaible "spell_list" is assigned to a list of strings. spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] # find length list # The variable "spell_len" is assigned to the given value when determining the length of the value assigned to the # spell_list by using the len() function. spell_len = len(spell_list) # find lenght of 1st half (aka - start of 2nd half) # The variable "half_1" is assigned to the quotient, which is from the value assigned to the spell_len variable divided by the # integer "2", after being converted into an integer due to it being within the parentheses of the int() function. half_1 = int(spell_len/2) # print 2nd half list # By using the for...in loop, a sequence of integers generated by the range() function (with a start value being the value # assigned to the half_1 variable, a stop value being the value assigned to the spell_len variable, and a step value of 1), # is iterated. Subsequently, the value assigned to the word variable will serve as the index position for the spell_list # variable, and displayed the value in that index position in the value assigned to the spell_list variable in the output. # This loop will continue until each element generated by the range() function is iterated. for word in range(half_1,spell_len): print(spell_list[word])

# [ ] using range(start,stop), .append() the numbers 5 to 15 to the list: five_fifteen # [ ] print list five_fifteen # The variable "five_fifteen" is assigned to an empty string. five_fifteen = [] # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 5, a stop # value of 16, and a step value of 1), is iterated. Subsequently, the value assigned to the count variable will be add # to the end of the value assigned to the five_fifteen variable due to the list method ".append()". This loop will continue # until each element generated by the range() function is iterated. for count in range(5,16): five_fifteen.append(count) # This function displays the value assigned to the five_fifteen variable in the output. print(five_fifteen)

# [ ] using range(start,stop) - print the 3rd, 4th and 5th words in spell_list # output should include "February", "November", "Annual" # The variable "spell_list" is assigned to a list of strings. spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 2, a stop # value of 5, and a step value of 1), is iterated. Subsequently, the value assigned to the word variable will serve as the # index position for the spell_list variable, and displayed the value in that index position in the value assigned to the # spell_list variable in the output. This loop will continue until each element generated by the range() function is # iterated. for word in range(2,5): print(spell_list[word])

# [ ] using code find the index of "Annual" in spell_list # [ ] using range, print the spell_list including "Annual" to end of list # The variable "spell_list" is assigned to a list of strings. spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] # The variable "x" is assigned to the given value when determining the index position of the string "Annual" in the value # assigned to the spell_list variable, by using the list method ".index()". x = spell_list.index("Annual") # The variable "y" is assigned to the value the list method ".pop()" removed from the value assigned to the spell_list # variable, when given the index position of the value assigned to the x variable. y = spell_list.pop(x) # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 0, a stop # value of 7, and a step value of 1), is iterated. Subsequently, the value assigned to the y variable will be add to the # value assigned to the spell_list vairbale. Additionally, the value assigned to the word variable will serve as the # index position for the spell_list variable, and display the value in that index position in the value assigned to the # spell_list variable in the output. This loop will continue until each element generated by the range() function is # iterated. for word in range(0,7): spell_list.append(y) print(spell_list[word])

# [ ] review and run example # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 25, a stop # value of 101, and a step value of 25), is iterated and displayed on separate lines in the output one at a time. This loop # will continue until each element generated by the range() function is iterated. for count in range(25,101,25): print(count)

# [ ] review and run example # The variable "sub_total" is assigned to the integer "0". sub_total = 0 # The variable "temp" is assigned to the integer "0". temp = 0 # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 25, a stop # value of 46, and a step value of 5), is iterated. Subsequently, the value assigned to the sub_total variable is assign # to the temp variable. Following that, the sub_total variable is reassigned to the value assigned to the sub_total # variable added to the value assigned to the item variable. Additionally, the string "sub_total", the value assigned to # the temp variable, the string "=" the value assigned to the item variable, the string "=", and the variable assigned to # the sub_total variable, will be display in the output. This loop will continue until each element generated by the range() # function is iterated. for item in range(25,46,5): temp = sub_total sub_total += item print("sub_total:", temp, "+", item, "=",sub_total) # This function displays the string "Total =" and the value assigned to the sub_total variable in the output. print("Total =", sub_total)

# [ ] review and run example printing the 1st and then every other word in spell_list # The variable "spell_list" is assigned to a list of strings. spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 0, a stop # value being the given value when determining the length of the value assigned to the spell_list variable by using the # len() function, and a step value of 2), is iterated. Subsequently, the value assigned to the index variable will serve as # the index position for the spell_list variable, and display the value in that index position in the value assigned to # the spell_list variable in the output. This loop will continue until each element generated by the range() function is # iterated. for index in range(0,len(spell_list),2): print(spell_list[index])

# [ ] review and run example casting range to list # The variable "odd_list" is assigned to the sequence of integers generated by the range() function (with a start value of # 1, stop value of 20, and step value of 2), after being changed into a list by the list() function. odd_list = list(range(1,20,2)) # This function displays the value assigned to the odd_list variable in the output. print(odd_list)

# [ ] print numbers 10 to 20 by 2's using range # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 10, a stop # value of 21, and a step value of 2), is iterated and displayed on separate lines in the output one at a time. This loop # will continue until each element generated by the range() function is iterated. for count in range(10,21,2): print(count)

# [ ] print numbers 20 to 10 using range (need to countdown) # Hint: start at 20 # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 20, a stop # value of 9, and a step value of -1), is iterated and displayed on separate lines in the output one at a time. This loop # will continue until each element generated by the range() function is iterated. for count in range(20,9,-1): print(count)

# [ ] print first and every third word in spell_list # The variable "spell_list" is assigned to a list of strings. spell_list = ["Tuesday", "Wednesday", "February", "November", "Annual", "Calendar", "Solstice"] # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 0, a stop # value of 7, and a step value of 3), is iterated. Subsequently, the value assigned to the word variable will serve as the # index position for the spell_list variable, and display the value in that index position in the value assigned to the # spell_list variable in the output. This loop will continue until each element generated by the range() function is # iterated. for word in range(0,7,3): print(spell_list[word])

# [ ] complete List of letters program- test with the word "complexity" # The variable "word" will be assign to the entry the user inputs when presented with the string "Enter a word: ". word = input("Enter a word: ") # The variable "odd_letters" is assigned to an empty list. odd_letters = [] # The variable "even_letters" is assigned to an empty list. even_letters = [] # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 0, a stop # value being the given value when determining the length of the value assigned to the word variable by using the len() # function, and a step value of 2), is iterated. Subsequently, the value assigned to the odd variable will serve as the # index position for the word variable, and be added to the value assigned to the odd_letters variable due to the list # method ".append()"". This loop will continue until each element generated by the range() function is iterated. for odd in range(0, len(word), 2): odd_letters.append(word[odd]) # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 1, a stop # value being the given value when determining the length of the value assigned to the word variable by using the len() # function, and a step value of 2), is iterated. Subsequently, the value assigned to the even variable will serve as the # index position for the word variable, and be added to the value assigned to the even_letters variable due to the list # method ".append()"". This loop will continue until each element generated by the range() function is iterated. for even in range(1, len(word), 2): even_letters.append(word[even]) # This function displays the value assigned to the odd_letters variable in the output. print(odd_letters) # This function displays the value assigned to the even_letters variable in the output. print(even_letters)

# [ ] fix the error printing odd numbers 1 - 9 # This function originally contained an TypeError due to the values connected to the range() function are within square # brackets instead of parentheses. This issue is fixed by changing the square brackets into parentheses. # By using the for...in loop, a sequence of integers generated by the range() function (with a start value of 1, a stop # value of 10, and a step value of 2), is iterated and displayed on separate lines in the output one at a time. This loop # will continue until each element generated by the range() function is iterated. for num in range(1,10,2): print(num)