Python: find the smallest and largest value

题目要求：

Write a program that repeatedly prompts a user for integer numbers until the user enters 'done'. Once 'done' is entered, print out the largest and smallest of the numbers. If the user enters anything other than a valid number catch it with a try/except and put out an appropriate message and ignore the number. Enter 7, 2, bob, 10, and 4 and match the output below. [ Programming for Everybody (Getting Started with Python) 5.2 assignment ]

largest = None

smallest = None

while True:

    num = input("Enter a number: ")

    if num == "done" : break

    try:

        value = int(num)

    except:

        print("Invalid input")

        continue

    if largest is None or smallest is None:

        largest = value

        smallest = value

    elif smallest > value:

        smallest = value

    elif largest < value:

        largest = value

print("Maximum is", largest)

print("Minimum is", smallest)

用到的知识点：

try/except 抛出异常后，用continue 结束本次循环进入下次循环，阻止循环终止。
while 是 indefinite iteration; for 是definite iteration。区别在于：for 在循环体之前就知道循环的次数。
python 的数据格式：Int, Float, String, Boolean，None
break: Exits the currently executing loop
continue: Jumps to the "top" of the loop and starts the next iteration
'is' and 'is not' Operators:
1. both use in logic expressions
2. 'is': similar to, but stronger than ==, implies 'is the same as'
3. you shouldn’t use 'is' when you should use '=='
4. 'is' used for 'True', 'False', 'None'.
5. don’t use 'is' frequently, cause it’s strong equality, stronger than ==

巴特西

Python: find the smallest and largest value

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