《Python编程从入门到实践》课后练习题答案+注解
License: MIT License
运行7-4程序
prompt = "\nTell me Pizza Toppings"
prompt += "\nEnter 'quit' to end the program."
active = True
while active:
message = input(prompt)
if message == 'quit':
active = False
else:
print("add " + message)报错信息
$ python -u 7-4.py
Tell me Pizza Toppings
Enter 'quit' to end the program.quit
Traceback (most recent call last):
File "7-4.py", line 11, in <module>
print("add " + message)
TypeError: cannot concatenate 'str' and 'Quitter' objects
input交互进来的message，应该就是string类型啊。
运行8-16print_models.py程序
import printing_functions
unprinted_designs = ['iphone case', 'robot pendant', 'dodecahedron']
completed_models = []
print_models(unprinted_designs, completed_models)
show_completed_models(completed_models)报错信息
Traceback (most recent call last):
File "/home/zoctopus/code/github_organization/programming-book-practice/Python-Crash-Course-Homework/chapter08/print_models.py", line 6, in <module>
print_models(unprinted_designs, completed_models)
NameError: name 'print_models' is not defined
按照书上讲解，import文件名后，这个被引入文件里的所有定义的函数都是通用的。
为什么报not defined的错误呢？
10-1练习
--- Reading in the entire file:
Traceback (most recent call last):
File "./Python-Crash-Course-Homework/chapter10/10-1.py", line 7, in <module>
with open(filename) as f:
IOError: [Errno 2] No such file or directory: 'learning_python.txt'
文件确实存在，文件名没有写错，路径正确，是哪里出了问题？
IN 9.8 Privileges类不是一个管理类的一个子类，所以在定义管理类的实例eric的时候eric.privilege.show.privilege是错误的因为eric的 privilege 没有对应的function
9-4.py Output
Number served: <bound method Restaurant.set_number_served of <__main__.Restaurant instance at 0x7fb4470ac998>>
Number served: 430
Number served: 1257
Number served: 1496
Why not first Number served is 0 ?
练习 9-6,9-7,9-8时出现的错误
Traceback (most recent call last):
File "./Python-Crash-Course-Homework/chapter09/9-8.py", line 44, in <module>
eric = Admin('eric', 'matthes', 'e_matthes', '[email protected]', 'alaska')
File "./Python-Crash-Course-Homework/chapter09/9-8.py", line 24, in __init__
super().__init__(first_name, last_name, username, email, location)
TypeError: super() takes at least 1 argument (0 given)
运行7-10程序：
name_prompt = "\nWhat's your name? "
place_prompt = "If you could visit one place in the world, where would it be? "
continue_prompt = "\nWould you like to let someone else respond? (yes/no) "
responses = {}
while True:
name = input(name_prompt)
place = input(place_prompt)
responses[name] = place
repeat = input(continue_prompt)
if repeat != 'yes':
break
print("\n--- Results ---")
for name, place in responses.items():
print(name.title() + " would like to visit " + place.title() + ".")报错信息
$ python -u 7-10.py
What's your name? z
Traceback (most recent call last):
File "7-10.py", line 8, in <module>
name = input(name_prompt)
File "<string>", line 1, in <module>
NameError: name 'z' is not defined
请教：
在 if 和 else 之间编写任何其他代码，会出现SyntaxError，
为什么该小节例子中 if和else之间的代码却可以正常运行呢？
print("Give me two numbers, and I'll divide them.")
print("Enter 'q' to quit.")
while True:
first_number = input("\nFirst number: ")
if first_number == 'q':
break
second_number = input("Second number: ")
try:
answer = int(first_number) / int(second_number)
except ZeroDivisionError:
print("You can't divide by 0!")
else:
print(answer)
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