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Python programs are saved as ordinary text files (with the extension .py). This means we can read them and process them just like any other data file. Write a function num_whiles (filename) that reads the Python program file with the given filename and returns a count of the number of while loops found in that program. More precisely, your function should return the number of lines starting with (possibly) some white space followed by the string 'while , i.e. the word while with a space at the end. This is usually, but not necessarily, the same as the number of while loops in the program, but we won't worry about that here. In the first example below, the file testo.py contains the following program: i = 0 while i < 10: print(i) i += 1 In the second example, the test itself generates and writes a test file. Writing files will be covered later in this learning module, but you can probably figure out what's happening anyway by reading the test code. Notes: • You may assume the given file exists, but it may be empty (i.e., containing no lines). • Two string methods will help you. What are they? • You will need to make your own test files and test your function with these. For example: Test Result print (num_whiles("teste.py")) 1 2 # Generate a test file containing... while_file open("while_file.py", "w") = # ...one un-indented while... while_file.write("while 1 > 0: \n") # ...and one indented while while_file.write(" while_file.close() # Now use it for testing print (num_whiles("while_file.py")) while < 1: \n")

Python programs are saved as ordinary text files (with the extension .py). This means we can read them and process them just like any other data file. Write a function num_whiles (filename) that reads the Python program file with the given filename and returns a count of the number of while loops found in that program. More precisely, your function should return the number of lines starting with (possibly) some white space followed by the string 'while , i.e. the word while with a space at the end. This is usually, but not necessarily, the same as the number of while loops in the program, but we won't worry about that here. In the first example below, the file testo.py contains the following program: i = 0 while i < 10: print(i) i += 1 In the second example, the test itself generates and writes a test file. Writing files will be covered later in this learning module, but you can probably figure out what's happening anyway by reading the test code. Notes: • You may assume the given file exists, but it may be empty (i.e., containing no lines). • Two string methods will help you. What are they? • You will need to make your own test files and test your function with these. For example: Test Result print (num_whiles("teste.py")) 1 2 # Generate a test file containing... while_file open("while_file.py", "w") = # ...one un-indented while... while_file.write("while 1 > 0: \n") # ...and one indented while while_file.write(" while_file.close() # Now use it for testing print (num_whiles("while_file.py")) while < 1: \n")

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Python programs are saved as ordinary text files (with the extension.py). This means we can read them and process them just like any other data file. Write a function num_whiles (filename) that reads the Python program file with the given filename and returns a count of the number of while loops found in that program. More precisely, your function should return the number of lines starting with (possibly) some white space followed by the string 'while , i.e. the word while with a space at the end. This is usually, but not necessarily, the same as the number of while loops in the program, but we won't worry about that here. In the first example below, the file testo.py contains the following program: i = 0 while i < 10: print(i) i += 1 In the second example, the test itself generates and writes a test file. Writing files will be covered later in this learning module, but you can probably figure out what's happening anyway by reading the test code. Notes: • You may assume the given file exists, but it may be empty (i.e., containing no lines). • Two string methods will help you. What are they? • You will need to make your own test files and test your function with these. For example: Test Result 1 print (num_whiles ("testo.py")) 2 # Generate a test file containing... while_file = open("while_file.py", "w") # ...one un-indented while... while_file.write("while 1 > 0: \n") # ...and one indented while while_file.write(" while < 1: \n") while_file.close() # Now use it for testing print (num_whiles("while_file.py"))
Transcribed Image Text:Python programs are saved as ordinary text files (with the extension.py). This means we can read them and process them just like any other data file. Write a function num_whiles (filename) that reads the Python program file with the given filename and returns a count of the number of while loops found in that program. More precisely, your function should return the number of lines starting with (possibly) some white space followed by the string 'while , i.e. the word while with a space at the end. This is usually, but not necessarily, the same as the number of while loops in the program, but we won't worry about that here. In the first example below, the file testo.py contains the following program: i = 0 while i < 10: print(i) i += 1 In the second example, the test itself generates and writes a test file. Writing files will be covered later in this learning module, but you can probably figure out what's happening anyway by reading the test code. Notes: • You may assume the given file exists, but it may be empty (i.e., containing no lines). • Two string methods will help you. What are they? • You will need to make your own test files and test your function with these. For example: Test Result 1 print (num_whiles ("testo.py")) 2 # Generate a test file containing... while_file = open("while_file.py", "w") # ...one un-indented while... while_file.write("while 1 > 0: \n") # ...and one indented while while_file.write(" while < 1: \n") while_file.close() # Now use it for testing print (num_whiles("while_file.py"))
print (num_whiles("testo.py")) # Generate a test file containing... 2 while_file = open("while_file.py", "w") #...one un-indented while... while_file.write("while 1 > 0: \n") # ...and one indented while while_file.write(" while_file.close() # Now use it for testing print (num_whiles("while_file.py")) 100 # Generate a test file with 100 whiles whiliest = open("whiliest.py", "w") for i in range (100): * whiliest.write(f"{' i}while True: \n") whiliest.close() # Now use it for testing print (num_whiles("whiliest.py")) 0 empty_file = open("empty.py", "w") empty_file.close() print (num_whiles ("empty.py")) # test.py contains a single while loop and various non-while lines. 1 print (num_whiles("test.py")) 4 # Are you only counting whiles with spaces after them? print (num_whiles ("test1.py")) while < 1: \n") 1
Transcribed Image Text:print (num_whiles("testo.py")) # Generate a test file containing... 2 while_file = open("while_file.py", "w") #...one un-indented while... while_file.write("while 1 > 0: \n") # ...and one indented while while_file.write(" while_file.close() # Now use it for testing print (num_whiles("while_file.py")) 100 # Generate a test file with 100 whiles whiliest = open("whiliest.py", "w") for i in range (100): * whiliest.write(f"{' i}while True: \n") whiliest.close() # Now use it for testing print (num_whiles("whiliest.py")) 0 empty_file = open("empty.py", "w") empty_file.close() print (num_whiles ("empty.py")) # test.py contains a single while loop and various non-while lines. 1 print (num_whiles("test.py")) 4 # Are you only counting whiles with spaces after them? print (num_whiles ("test1.py")) while < 1: \n") 1
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