- Python Shortcuts, Commands, and Packages
- 4.2 Twenty-Two Programming Shortcuts
- 4.3 Running Python from the Command Line
- 4.4 Writing and Using Doc Strings
- 4.5 Importing Packages
- 4.6 A Guided Tour of Python Packages
- 4.7函数作为一类对象
- 4.8 Variable-Length Argument Lists
- 4.9 Decorators and Function Profilers
- 4.10 Generators
- 4.11 Accessing Command-Line Arguments
- 第四章Summary
- 第四章Questions for Review
- 第四章Suggested Problems
第四章Questions for Review
Is an assignment operator such as+=only a convenience? Can it actually result in faster performance at run time?
In most computer languages, what is the minimum number of statements you’d need to write instead of the Python statementa, b = a + b, a?
What’s the most efficient way to initialize a list of 100 integers to 0 in Python?
What’s the most efficient way of initializing a list of 99 integers with the pattern1, 2, 3重复?显示准确的何w to do that, if possible.
If you’re running a Python program from within IDLE, describe how to most efficiently print a multidimensional list.
Can you use list comprehension on a string? If so, how?
How can you get help on a user-written Python program from the command line? From within IDLE?
Functions are said to be “first-class objects” in Python but not in most other languages, such as C++ or Java. What is something you can do with a Python function (callable object) that you cannot do in C or C++?
What’s the difference between a wrapper, a wrapped function, and a decorator?
When a function is a generator function, what does it return, if anything?
From the standpoint of the Python language, what is the one change that needs to be made to a function to turn it into a generator function?
Name at least one advantage of generators.