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- Meaning of list[-1] in Python - Stack Overflow
I have a piece of code here that is supposed to return the least common element in a list of elements, ordered by commonality: def getSingle(arr): from collections import Counter c = Counte
- python - if else in a list comprehension - Stack Overflow
Since a list comprehension creates a list, it shouldn't be used if creating a list is not the goal; it shouldn't be used simply to write a one-line for-loop; so refrain from writing [print(x) for x in range(5)] for example
- slice - How slicing in Python works - Stack Overflow
The first way works for a list or a string; the second way only works for a list, because slice assignment isn't allowed for strings Other than that I think the only difference is speed: it looks like it's a little faster the first way Try it yourself with timeit timeit () or preferably timeit repeat ()
- Sorting a list with stream. sorted () in Java - Stack Overflow
Sorted list: [20 455, 23 455, 24 455, 28 455] Are you sure you are not verifying list instead of sortedList [in above example] i e you are storing the result of stream() in a new List object and verifying that object?
- What is the difference between list and list [:] in python?
When reading, list is a reference to the original list, and list[:] shallow-copies the list When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list Also, don't use list as a name since it shadows the built-in
- pandas dataframe index: to_list () vs tolist () - Stack Overflow
Note that the question was about pandas tolist vs to_list pandas DataFrame values returns a numpy array and numpy indeed has only tolist Indeed, if you read the discussion about the issue linked in the accepted answer, numpy's tolink is the reason why pandas used tolink and why they did not deprecate it after introducing to_list
- Filter dataframe rows if value in column is in a set list of values
134 isin() is ideal if you have a list of exact matches, but if you have a list of partial matches or substrings to look for, you can filter using the str contains method and regular expressions For example, if we want to return a DataFrame where all of the stock IDs which begin with '600' and then are followed by any three digits:
- How to list the certificates stored in a PKCS12 keystore with keytool . . .
17 You can list down the entries (certificates details) with the keytool and even you don't need to mention the store type Also, the p12 and pfx are both PKCS#12 files Assume that you've the keystore file cert pfx or cert p12 then you can use the following command to list down the content keytool -list -v -keystore cert pfx -storepass
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