How to iterate over rows in a DataFrame in Pandas
DataFrame.iterrows is a generator which yields both the index and row (as a Series):
Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values, you must pass an index”
The error message says that if you’re passing scalar values, you have to pass an index. So you can either not use scalar values for the columns — e.g. use a list: or use scalar values and pass an index:
map function for objects (instead of arrays)
There is no native map to the Object object, but how about this: Run code snippet But you could easily iterate over an object using for … in: Run code snippet Update A lot of people are mentioning that the previous methods do not return a new object, but rather operate on the object itself. For that matter I wanted … Read more
Docker: How to delete all local Docker images
For Unix To delete all containers including its volumes use, To delete all the images, Remember, you should remove all the containers before removing all the images from which those containers were created. For Windows In case you are working on Windows (Powershell), Based on the comment from CodeSix, one liner for Windows Powershell, For … Read more
What is the difference among col-lg-*, col-md-* and col-sm-* in Bootstrap?
Bootstrap 5 In Bootstrap 5 (alpha) there is a new -xxl- size: col-* – 0 (xs)col-sm-* – 576pxcol-md-* – 768pxcol-lg-* – 992pxcol-xl-* – 1200pxcol-xxl-* – 1400px Bootstrap 5 Grid Demo Bootstrap 4 In Bootstrap 4 there is a new -xl- size, see this demo. Also the -xs- infix has been removed, so smallest columns are simply col-1, col-2.. col-12, etc.. col-* – 0 (xs)col-sm-* – 576pxcol-md-* – 768pxcol-lg-* – 992pxcol-xl-* – 1200px Bootstrap 4 Grid Demo Additionally, Bootstrap 4 includes … Read more
Column order manipulation using col-lg-push and col-lg-pull in Twitter Bootstrap 3
This answer is in three parts, see below for the official release (v3 and v4) I couldn’t even find the col-lg-push-x or pull classes in the original files for RC1 i downloaded, so check your bootstrap.css file. hopefully this is something they will sort out in RC2. anyways, the col-push-* and pull classes did exist … Read more
What is the purpose of the return statement?
The print() function writes, i.e., “prints”, a string in the console. The return statement causes your function to exit and hand back a value to its caller. The point of functions in general is to take in inputs and return something. The return statement is used when a function is ready to return a value to its caller. For example, here’s … Read more
pthread_join() and pthread_exit()
In pthread_exit, ret is an input parameter. You are simply passing the address of a variable to the function. In pthread_join, ret is an output parameter. You get back a value from the function. Such value can, for example, be set to NULL. Long explanation: In pthread_join, you get back the address passed to pthread_exit by the finished thread. If you pass just a plain … Read more
How do I specify new lines on Python, when writing on files?
It depends on how correct you want to be. \n will usually do the job. If you really want to get it right, you look up the newline character in the os package. (It’s actually called linesep.) Note: when writing to files using the Python API, do not use the os.linesep. Just use \n; Python automatically translates that to the proper newline … Read more
How can I represent an infinite number in Python?
In Python, you can do: In Python 3.5, you can do: And then: Will always be true. Unless of course, as pointed out, x is also infinity or “nan” (“not a number”). Additionally (Python 2.x ONLY), in a comparison to Ellipsis, float(inf) is lesser, e.g: would return true.