First Chapter

GitBook allows you to organize your book into chapters, each chapter is stored in a separate file like this one.

例外處理

We can handle exceptions using the try..except statement.

try:
    text = input('Enter something --> ')
except EOFError:
    print('Why did you do an EOF on me?')
except KeyboardInterrupt:
    print('You cancelled the operation.')
else:
    print('You entered {}'.format(text))

Try ... Finally

import sys
import time

f = None
try:
    f = open("poem.txt")
    # Our usual file-reading idiom
    while True:
        line = f.readline()
        if len(line) == 0:
            break
        print(line, end='')
        sys.stdout.flush()
        print("Press ctrl+c now")
        # To make sure it runs for a while
        time.sleep(2)
except IOError:
    print("Could not find file poem.txt")
except KeyboardInterrupt:
    print("!! You cancelled the reading from the file.")
finally:
    if f:
        f.close()
    print("(Cleaning up: Closed the file)")

經典問題 (1) Iris (2) Housing price (3) Titanic (4) Mnist