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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 Langauge

To help increase memorability, business owners sometimes encode their phone numbers as mnemonic phrases, known as phonewords. These are alphanumeric equivalents of a phone number, which can be derived by using the mapping of letters on the digits of a telephone keypad. Many popular phone keypads have letters and numbers that look similar to the figure on the right. With this mapping, we can make the following conver- sion, for example: АВС DEF 123 3 GHI JKL MNO 4 5 6 PQRS TUV WXYZ 7 8 • FLOWERS translates into 3569377; • PrOGrAM translates into 7764726; and • Battery translates into 2288379. * Your Task: You will implement a function Image from code golf phoneWord2Num(word: str) -> int that takes as input a string of length exactly 7, where each position is an upper- or lower- case letter in the English alphabet. The function must return an integer (of type int) representing the phone number that is the equivalent of the input string. As an example, we would call phoneWord2Num("Pr0GrAM") and expect the integer 7764726 as the return value. TIPS: You may wish to write a new function (generally known as a helper function because its role is to help complete the main task at hand) that takes in one letter and returns a number corresponding to that letter. To implement such a helper function, you may find comfort in knowing that if letter is a single char- acter and pattern is a string, the expression letter in pattern returns True or False indicating whether the letter belongs in that pattern. This means: q1 'a' in 'pxrt' # q1 wil1 be False 'x' in 'pxrt' # q2_will be True q2 RESTRICTIONS: You can only used Python features we have covered in this class so far. Remember that we haven't done iterations (for-, while- loops) or lists. #3
Transcribed Image Text:To help increase memorability, business owners sometimes encode their phone numbers as mnemonic phrases, known as phonewords. These are alphanumeric equivalents of a phone number, which can be derived by using the mapping of letters on the digits of a telephone keypad. Many popular phone keypads have letters and numbers that look similar to the figure on the right. With this mapping, we can make the following conver- sion, for example: АВС DEF 123 3 GHI JKL MNO 4 5 6 PQRS TUV WXYZ 7 8 • FLOWERS translates into 3569377; • PrOGrAM translates into 7764726; and • Battery translates into 2288379. * Your Task: You will implement a function Image from code golf phoneWord2Num(word: str) -> int that takes as input a string of length exactly 7, where each position is an upper- or lower- case letter in the English alphabet. The function must return an integer (of type int) representing the phone number that is the equivalent of the input string. As an example, we would call phoneWord2Num("Pr0GrAM") and expect the integer 7764726 as the return value. TIPS: You may wish to write a new function (generally known as a helper function because its role is to help complete the main task at hand) that takes in one letter and returns a number corresponding to that letter. To implement such a helper function, you may find comfort in knowing that if letter is a single char- acter and pattern is a string, the expression letter in pattern returns True or False indicating whether the letter belongs in that pattern. This means: q1 'a' in 'pxrt' # q1 wil1 be False 'x' in 'pxrt' # q2_will be True q2 RESTRICTIONS: You can only used Python features we have covered in this class so far. Remember that we haven't done iterations (for-, while- loops) or lists. #3
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