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chenguohuichenguohui
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Chapter 11 finished
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‎10-debug/README.md

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# raise
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<pre>raise Exception(msg)</pre>
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# try...except...as...
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<pre>try:
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code block
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except Exception as err:
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error handling</pre>
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# traceback.format_exc()
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* convert traceback stack info to be a string
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# assert condition, message
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* Python -O option will disable assertions
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# logging module
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<pre>
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import logging
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logging.disable（logging.CRITICAL）
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logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s - %(levelname)s - %(message)s')
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logging.basicConfig(filename='myProgramLog.txt', level=logging.DEBUG,
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format='(asctime)s - %(levelname)s - %(message)s')
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logging.debug('Start of program')
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</pre>

‎10-debug/boxPrint.py

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def boxPrint(symbol, width, height):
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if len(symbol) != 1:
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raise Exception('Symbol must be a single character string.')
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if width <= 2:
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raise Exception('Width must be greater than 2.')
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if height <= 2:
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raise Exception('Height must be greater than 2.')
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print(symbol * width)
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for i in range(height - 2):
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print(symbol + (' ' * (width - 2)) + symbol)
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print(symbol * width)
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for sym, w, h in (('*', 4, 4), ('O', 20, 5), ('x', 1, 3), ('ZZ', 3, 3)):
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try:
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boxPrint(sym, w, h)
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except Exception as err:
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print('An exception happened: ' + str(err))

‎10-debug/buggyAddingProgram.py

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print('Enter the first number to add:')
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first = input()
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print('Enter the second number to add:')
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second = input()
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print('Enter the third number to add:')
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third = input()
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print('The sum is ' + first + second + third)

‎10-debug/carSim.py

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market_2nd = {'ns':'green', 'ew':'red'}
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mission_16th = {'ns':'yellow', 'ew':'green'}
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def switchLights(stoplight):
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assert 'red' in stoplight.values(), 'Neither light is red! ' + str(stoplight)
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for key in stoplight.keys():
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if stoplight[key] == 'green':
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stoplight[key] = 'yellow'
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elif stoplight[key] == 'yellow':
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stoplight[key] = 'red'
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elif stoplight[key] == 'red':
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stoplight[key] = 'green'
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switchLights(market_2nd)
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switchLights(mission_16th)

‎10-debug/coinFlip.py

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import random
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heads = 0
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for i in range(1, 1001):
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if random.randint(0, 1) == 1:
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heads = heads + 1
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if i == 500:
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print('Halfway done!')
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print('Heads came up ' + str(heads) + ' times.')

‎10-debug/errorExample.py

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def spam():
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bacon()
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def bacon():
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raise Exception('This is the error message.')
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spam()

‎10-debug/errorInfo.txt

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Traceback (most recent call last):
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File ".\format_exc.py", line 3, in <module>
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raise Exception('This is the error message.')
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Exception: This is the error message.

‎10-debug/factorialLog.py

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import logging
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# logging.disable(logging.CRITICAL)
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#logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')
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logging.basicConfig(filename='myProgramLog.txt', level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')
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logging.debug('Start of program')
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def factorial(n):
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logging.debug('Start of factorial(%s%%)' % (n))
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total = 1
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for i in range(1, n + 1):
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total *= i
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logging.debug('i is ' + str(i) + ', total is ' + str(total))
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return total
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logging.debug('End of factorial(%s%%)' % (n))
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print(factorial(5))
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logging.debug('End of program')

‎10-debug/format_exc.py

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import traceback
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try:
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raise Exception('This is the error message.')
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except:
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errorFile = open('errorInfo.txt', 'w')
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errorFile.write(traceback.format_exc())
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errorFile.close()
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print('The traceback info was written to errorInfo.txt.')

‎10-debug/guessCoin.py

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import random
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guess = ''
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ans = ('heads', 'tails')
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while guess not in ans:
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print('Guess the coin toss! Enter heads or tails:')
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guess = input()
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toss = ans[random.randint(0, 1)]
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if toss == guess:
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print('You got it!')
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else:
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print('Nope! Guess again! Enter heads or tails:')
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guess = input()
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toss = ans[random.randint(0, 1)]
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if toss == guess:
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print('You got it!')
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else:
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print('Nope. You are really bad at this game.')

‎10-debug/myProgramLog.txt

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2017-07-02 20:28:30,480 - DEBUG - Start of program
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2017-07-02 20:28:30,480 - DEBUG - Start of factorial(5%)
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2017-07-02 20:28:30,480 - DEBUG - i is 1, total is 1
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2017-07-02 20:28:30,480 - DEBUG - i is 2, total is 2
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2017-07-02 20:28:30,480 - DEBUG - i is 3, total is 6
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2017-07-02 20:28:30,480 - DEBUG - i is 4, total is 24
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2017-07-02 20:28:30,480 - DEBUG - i is 5, total is 120
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2017-07-02 20:28:30,480 - DEBUG - End of program

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