大约有 40,000 项符合查询结果（耗时：0.0384秒） [XML]
Way to read first few lines for pandas dataframe
Is there a built-in way to use read_csv to read only the first n lines of a file without knowing the length of the lines ahead of time? I have a large file that takes a long time to read, and occasionally only want to use the first, say, 20 lines to get a sample of it (and prefer not to load the...
Convert string to integer type in Go?
I'm trying to convert a string returned from flag.Arg(n) to an int . What is the idiomatic way to do this in Go?
5 Answe...
What are the special dollar sign shell variables?
In Bash, there appear to be several variables which hold special, consistently-meaning values. For instance,
4 Answers
...
How assignment works with Python list slice?
Python doc says that slicing a list returns a new list.
Now if a "new" list is being returned I've the following questions related to "Assignment to slices"
...
How to get JSON objects value if its name contains dots?
I have a very simple JSON array (please focus on "points.bean.pointsBase" object):
5 Answers
...
PHP regular expressions: No ending delimiter '^' found in
...
Active
Oldest
Votes
...
How to count items in a Go map?
If I want to count the items in the map structure, what statement should I use?
I tried to use
1 Answer
...
Reference list item by index within Django template?
This may be simple, but I looked around and couldn't find an answer. What's the best way to reference a single item in a list from a Django template?
...
add a string prefix to each value in a string column using Pandas
I would like to append a string to the start of each value in a said column of a pandas dataframe (elegantly).
I already figured out how to kind-of do this and I am currently using:
...
How can I set the aspect ratio in matplotlib?
I'm trying to make a square plot (using imshow), i.e. aspect ratio of 1:1, but I can't. None of these work:
5 Answers
...