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In this lesson we'll take a stopwatch component we built in another lesson and identify and fix a memory leak. Tow things to notice here is that: 1. t 阅读全文
posted @ 2017-12-07 20:33
Zhentiw
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In this lesson we'll learn about how you can use the prop-types module to validate a custom React component's props. You can write you own PropTypes v 阅读全文
posted @ 2017-12-07 20:09
Zhentiw
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import time import urllib import bs4 import requests start_url = "https://en.wikipedia.org/wiki/Special:Random" target_url = "https://en.wikipedia.org/wiki/Philosophy" def find_first_link(url): ... 阅读全文
posted @ 2017-12-07 16:36
Zhentiw
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# Python's list slice syntax can be used without indices # for a few fun and useful things: # You can clear all elements from a list: >>> lst = [1, 2, 3, 4, 5] >>> del lst[:] >>> lst [] # You can r... 阅读全文
posted @ 2017-12-07 15:39
Zhentiw
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https://docs.python.org/2/library/collections.html 阅读全文
posted @ 2017-12-07 15:20
Zhentiw
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>>> import itertools >>> for p in itertools.permutations('ABCD'): ... print(p) ('A', 'B', 'C', 'D') ('A', 'B', 'D', 'C') ('A', 'C', 'B', 'D') ('A', 'C', 'D 阅读全文
posted @ 2017-12-07 15:10
Zhentiw
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