大约有 11,292 项符合查询结果（耗时：0.0195秒） [XML]
How to determine whether a Pandas Column contains a particular value
... was not in the column 43 in df['id'] it still returned True . When I subset to a data frame only containing entries matching the missing id df[df['id'] == 43] there are, obviously, no entries in it. How to I determine if a column in a Pandas data frame contains a particular value and why doesn...
Sorting list based on values from another list?
...
Shortest Code
[x for _,x in sorted(zip(Y,X))]
Example:
X = ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
Y = [ 0, 1, 1, 0, 1, 2, 2, 0, 1]
Z = [x for _,x in sorted(zip(Y,X))]
print(Z) # ["a", "d", "h", "b", "c", "e", "i", "f", "g"]
Generally Speaking
[x for _, x in so...
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
...t it's 2016 I'd use PowerShell for this unless there's a really compelling backwards-compatible reason for it, particularly because of the regional settings issue with using date . See @npocmaka's https://stackoverflow.com/a/19799236/8479
...
Why does C++ require a user-provided default constructor to default-construct a const object?
...idered a defect (against all versions of the standard) and it was resolved by Core Working Group (CWG) Defect 253. The new wording for the standard states in http://eel.is/c++draft/dcl.init#7
A class type T is const-default-constructible if
default-initialization of T would invoke a user-provi...
What is the combinatory logic equivalent of intuitionistic type theory?
...t typed functional programming language), and was wondering if it was possible to replace lambda calculus in these with combinatory logic. With Haskell this seems possible using the S and K combinators, thus making it point-free. I was wondering what the equivalent was for Agda. I.e., can one make a...
Build an ASCII chart of the most commonly used words in a given text [closed]
Build an ASCII chart of the most commonly used words in a given text.
59 Answers
59
...
The opposite of Intersect()
Intersect can be used to find matches between two collections, like so:
8 Answers
8
...
How to test if one java class extends another at runtime?
How to I test if a is a subclass of b ?
3 Answers
3
...
Left align two graph edges (ggplot)
...f each other. I used grid.arrange from gridExtra to stack them. The problem is I want the left edges of the graphs to align as well as the right edges regardless of axis labels. (the problem arises because the labels of one graph are short while the other is long).
...
How to pretty print nested dictionaries?
...onary with depth of ~4 in Python? I tried pretty printing with pprint() , but it did not work:
21 Answers
...