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How can I find the dimensions of a matrix in Python?

The number of rows of a list of lists would be: len(A) and the number of columns len(A[0]) given that all rows have the same number of columns, i.e. all lists in each index are of the same size.

TensorFlow not found using pip

I found this to finally work. Edit 1: This was tested on Windows (8, 8.1, 10), Mac and Linux. Change python3 to python according to your configuration. Change py3 to py2 in the url if you are using Python 2.x. Edit 2: A list of different versions if someone needs: https://storage.googleapis.com/tensorflow Edit 3: A list of urls for the available wheel packages is available … Read more

Python/Django: log to console under runserver, log to file under Apache

Text printed to stderr will show up in httpd’s error log when running under mod_wsgi. You can either use print directly, or use logging instead.

urllib2.HTTPError: HTTP Error 403: Forbidden

By adding a few more headers I was able to get the data: Actually, it works with just this one additional header:

How to create a density plot in matplotlib?

Sven has shown how to use the class gaussian_kde from Scipy, but you will notice that it doesn’t look quite like what you generated with R. This is because gaussian_kde tries to infer the bandwidth automatically. You can play with the bandwidth in a way by changing the function covariance_factor of the gaussian_kde class. First, … Read more

How to read the last line of a file in Python?

I have a two requirements . First Requirement-I want to read the last line of a file and assign the last value to a variable in python. Second Requirement– Here is my sample file. From this file I want to read the content i.e filename.txt which will be after <context:property-placeholder location= ..And want to assign … Read more

What does sys.stdin read?

So you have used Python’s “pre built in functions”, presumably like this: This reads the file by invoking an iterator on the file object which happens to return the next line from the file. You could instead use: which reads the lines from the current file position into a list. Now, sys.stdin is just another file object, which happens … Read more

How to join on multiple columns in Pyspark?

You should use & / | operators and be careful about operator precedence (== has lower precedence than bitwise AND and OR):

Meaning of @classmethod and @staticmethod for beginner?

Though classmethod and staticmethod are quite similar, there’s a slight difference in usage for both entities: classmethod must have a reference to a class object as the first parameter, whereas staticmethod can have no parameters at all. Example Explanation Let’s assume an example of a class, dealing with date information (this will be our boilerplate): This class obviously could be used to store … Read more

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