Lab9 (1) - Jupyter Notebook

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 1/16 Laboratory 9: Count Controlled Repetition In [6]: Full name: Juan Zuluaga R#: 11830028 Title of the notebook: Loops, Looops, Loooooops Date: 09/28/23 Juans-MacBook-Pro.local juanandreszuluqga /Users/juanandreszuluqga/anaconda3/bin/python 3.11.4 (main, Jul 5 2023, 09:00:44) [Clang 14.0.6 ] sys.version_info(major=3, minor=11, micro=4, releaselevel='final', serial =0) # Preamble script block to identify host, user, and kernel import sys ! hostname ! whoami print (sys.executable) print (sys.version) print (sys.version_info)

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 2/16 Program flow control (Loops) Controlled repetition Structured FOR Loop Structured WHILE Loop Count controlled repetition Count-controlled repetition is also called definite repetition because the number of repetitions is known before the loop begins executing. When we do not know in advance the number of times we want to execute a statement, we cannot use count-controlled repetition. In such an instance, we would use sentinel-controlled repetition. A count-controlled repetition will exit after running a certain number of times. The count is kept in a variable called an index or counter. When the index reaches a certain value (the loop bound) the loop will end. Count-controlled repetition requires control variable (or loop counter) initial value of the control variable

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 4/16 for a in range(begin,end,increment): print(a) In [8]: Example: That's odd! Write a loop to print all the odd numbers between 0 and 10. In [9]: Walter Jesse Gus Hank 1 3 5 7 9 # set a list BB = [ "Walter" , "Jesse" , "Gus" , "Hank" ] # loop thru the list for i in range ( 0 , 4 , 1 ): # Change the numbers, what happens? print (BB[i]) # For loop with range for x in range ( 1 , 10 , 2 ): # a sequence from 2 to 5 with steps of 1 print (x)

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 5/16 Nested Repetition | Loops within Loops Round like a circle in a spiral, like a wheel within a wheel Never ending or beginning on an ever spinning reel Like a snowball down a mountain, or a carnival balloon Like a carousel that's turning running rings around the moon Like a clock whose hands are sweeping past the minutes of its face And the world is like an apple whirling silently in space Like the circles that you find in the windmills of your mind! Windmills of Your Mind lyrics © Sony/ATV Music Publishing LLC, BMG Rights Management Songwriters: Marilyn Bergman / Michel Legrand / Alan Bergman Recommended versions: Neil Diamond | Dusty Springfield | Farhad Mehrad "Like the circles that you find in the windmills of your mind", Nested repetition is when a control structure is placed inside of the body or main part of another control structure. break to exit out of a loop Sometimes you may want to exit the loop when a certain condition different from the counting condition is met. Perhaps you are looping through a list and want to exit when you find the first element in the list that matches some criterion. The break keyword is useful for such an operation. For example run the following program: In [10]: i = 0 j = 2 i = 1 j = 4 i = 2 j = 6 # j = 0 for i in range ( 0 , 5 , 1 ): j += 2 print ( "i = " ,i, "j = " ,j) if j == 6 : break

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 7/16 In [12]: import math # package that contains cosine print ( " Cosines " ) print ( " x " , "|" , " cos(x) " ) print ( "--------|--------" ) for i in range ( 0 , 100 , 1 ): x = float (i) * 0.001 print ( "%.3f" % x, " |" , " %.4f " % math.cos(x)) # note the format cod

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 8/16 Cosines x | cos(x) --------|-------- 0.000 | 1.0000 0.001 | 1.0000 0.002 | 1.0000 0.003 | 1.0000 0.004 | 1.0000 0.005 | 1.0000 0.006 | 1.0000 0.007 | 1.0000 0.008 | 1.0000 0.009 | 1.0000 0.010 | 1.0000 0.011 | 0.9999 0.012 | 0.9999 0.013 | 0.9999 0.014 | 0.9999 0.015 | 0.9999 0.016 | 0.9999 0.017 | 0.9999 0.018 | 0.9998 0.019 | 0.9998 0.020 | 0.9998 0.021 | 0.9998 0.022 | 0.9998 0.023 | 0.9997 0.024 | 0.9997 0.025 | 0.9997 0.026 | 0.9997 0.027 | 0.9996 0.028 | 0.9996 0.029 | 0.9996 0.030 | 0.9996 0.031 | 0.9995 0.032 | 0.9995 0.033 | 0.9995 0.034 | 0.9994 0.035 | 0.9994 0.036 | 0.9994 0.037 | 0.9993 0.038 | 0.9993 0.039 | 0.9992 0.040 | 0.9992 0.041 | 0.9992 0.042 | 0.9991 0.043 | 0.9991 0.044 | 0.9990 0.045 | 0.9990 0.046 | 0.9989 0.047 | 0.9989 0.048 | 0.9988 0.049 | 0.9988 0.050 | 0.9988 0.051 | 0.9987 0.052 | 0.9986 0.053 | 0.9986

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 10/16 Test the script with x values of 0.0, 1.0, 1.1, and 2.1. add functionality to automaticaly populate the table below: x y(x) 0.0 1.0 2.0 3.0 4.0 In [13]: Enter enter a float2.5 x: 2.5 y is equal to 4.5 userInput = input ( 'Enter enter a float' ) #ask for user's input x = float (userInput) print ( "x:" , x) if x >= 0 and x < 1 : y = x print ( "y is equal to" ,y) elif x >= 1 and x < 2 : y = x * x print ( "y is equal to" ,y) else : y = x + 2 print ( "y is equal to" ,y)

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 11/16 In [14]: ---x--- | ---y--- --------|-------- 0 | 0 1 | 1 2 | 4 3 | 5 4 | 6 5 | 7 # without pretty table print ( "---x---" , "|" , "---y---" ) print ( "--------|--------" ) for x in range ( 0 , 6 , 1 ): if x >= 0 and x < 1 : y = x print ( "%4.f" % x, " |" , " %4.f " % y) elif x >= 1 and x < 2 : y = x * x print ( "%4.f" % x, " |" , " %4.f " % y) else : y = x + 2 print ( "%4.f" % x, " |" , " %4.f " % y)

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 13/16 In [16]: EXERCISE Print your name in 3 rows and columns by using nested for loops In [17]: i = 0 , j = 2 this message will be skipped over if j = 6 i = 1 , j = 4 this message will be skipped over if j = 6 i = 2 , j = 6 i = 3 , j = 8 this message will be skipped over if j = 6 i = 4 , j = 10 this message will be skipped over if j = 6 Juan Juan Juan Juan Juan Juan Juan Juan Juan j = 0 for i in range ( 0 , 5 , 1 ): j += 2 print ( "\n i = " , i , ", j = " , j) #here the \n is a newline command if j == 6 : continue print ( " this message will be skipped over if j = 6 " ) # still within th #When j ==6 the line after the continue keyword is not printed. #Other than that one difference the rest of the script runs normally. #Write your code here name = "Juan" for i in range ( 3 ): for j in range ( 3 ): print (name, end = "\t" ) print ()

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 14/16 Here are some great reads on this topic: "Python for Loop" available at * https://www.programiz.com/python-programming/for-loop/ (https://www.programiz.com/python-programming/for-loop/) "Python "for" Loops (Definite Iteration)" by John Sturtz available at * https://realpython.com/python-for-loop/ (https://realpython.com/python-for-loop/) "Python "while" Loops (Indefinite Iteration)" by John Sturtz available at * https://realpython.com/python-while-loop/ (https://realpython.com/python-while-loop/) "loops in python" available at * https://www.geeksforgeeks.org/loops-in-python/ (https://www.geeksforgeeks.org/loops-in-python/) "Python Exceptions: An Introduction" by Said van de Klundert available at * https://realpython.com/python-exceptions/ (https://realpython.com/python-exceptions/) Here are some great videos on these topics: "Python For Loops - Python Tutorial for Absolute Beginners" by Programming with Mosh available at * https://www.youtube.com/watch?v=94UHCEmprCY (https://www.youtube.com/watch?v=94UHCEmprCY) "Python Tutorial for Beginners 7: Loops and Iterations - For/While Loops" by Corey S h f il bl t * htt // t b / t h? 6iF8Xb7Z3 Q

9/29/23, 12:02 PM Lab9 (1) - Jupyter Notebook localhost:8888/notebooks/Lab9 (1).ipynb# 16/16 In [18]: Cell In[18], line 2 based on their eligibility, it's more practical to use a WHILE loop. This is because a WHILE loop allows us to ^ SyntaxError: unterminated string literal (detected at line 2) When deciding between a FOR loop and a WHILE loop for the task of administe based on their eligibility, it 's more practical to use a WHILE loop. This i continuously check each person 's eligibility and administer the vaccine un individuals.