The problem of judging whether the key of hash operation exists in python.
This article shows you the problem of judging whether there is a key for hash operation in python. The content is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.
> c = "abcdeabccqq"
> for i in c:
...
Val=1+val.setdefault (cPol 0)
...
> print val
{'aqure: 34, 'abcdeabccqq':: 34,' eBay: 34, 'daddy: 34,' Q: 34, 'baked: 34}
...
> print val
{'aqure: 34, 'abcdeabccqq':: 34,' eBay: 34, 'daddy: 34,' Q: 34, 'baked: 34}
Our general operating habits may have habits from c code in it.
Generally speaking, it is necessary to judge whether hash [key] is there or not.
If hash.haskey (key):
Then xxxxxx
If you use hash.setdefault (key,xx), you can avoid the above judgment when writing code and make the code look cleaner. The above is the problem of judging whether there is a key of hash operation in python. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.
