python - Read For Learn

How do I install pip on macOS or OS X?

pip’s documentation lists the supported mechanisms to install it: https://pip.pypa.io/en/stable/installation/#supported-methods It is generally recommended to avoid installing pip on the OS-provided python commands, and to install Python via the https://python.org installers or using something like Homebrew or pyenv. Python 3.4+ will have ensurepip, so if you’re unable to run python3 -m pip — run python3 -m ensurepip and it’ll install pip for you. If you’re using an end-of-life … Read more

Error in Reading a csv file in pandas[CParserError: Error tokenizing data. C error: Buffer overflow caught – possible malformed input file.]

I found this error, the cause was that there were some carriage returns “\r” in the data that pandas was using as a line terminator as if it was “\n”. I thought I’d post here as that might be a common reason this error might come up. The solution I found was to add lineterminator=’\n’ … Read more

How to install PyQt4 on Windows using pip?

Here are Windows wheel packages built by Chris Golke – Python Windows Binary packages – PyQt In the filenames cp27 means C-python version 2.7, cp35 means python 3.5, etc. Since Qt is a more complicated system with a compiled C++ codebase underlying the python interface it provides you, it can be more complex to build … Read more

Conditional indexing with Numpy ndarray

For a numpy based solution, you can use numpy.where and then get the row indexes from it and then use it for indexing you matrix. Example – Demo – Another method , as indicated in the comments would be to use boolean masks, Example – Demo –

python-How to set global variables in Flask?

With: You are not defining, just declaring so it’s like saying there is a global index_add_counter variable elsewhere, and not create a global called index_add_counter. As you name don’t exists, Python is telling you it can not import that name. So you need to simply remove the global keyword and initialize your variable: Now you can import it with: The construction: is used … Read more

Write a program that asks the user to enter five test scores. Correspond it to a letter grade

This formats the output the way you want to format it:

AttributeError: ‘module’ object has no attribute ‘main’ for tf.app.run()

You either need a “def main(args)” function in your file: or tf.app.run() can call an external function

Python 2.7 mixing iteration and read methods would lose data

The problem is that you are using next and readline on the same file. As the docs say: . As a consequence of using a read-ahead buffer, combining next() with other file methods (like readline()) does not work right. The fix is trivial: replace next with readline.

Value for epsilon in Python

The information is available in sys.float_info, which corresponds to float.h in C99.

How to use python 3.5.1 with a MySQL database

I did the steps below with Python 3.5.1 and it works: Download driver from here Driver installation in cmd, in this folder Python\Python35\PyMySQL-0.7.4\pymysqlpython setup.py build python setup.py install Copy folder Python\Python35\PyMySQL-0.7.4\pymysql to Python\Python35\pymysql Sample code in python IDEimport pymysql import pymysql.cursors conn= pymysql.connect(host=’localhost’,user=’user’,password=’user’,db=’testdb’,charset=’utf8mb4′,cursorclass=pymysql.cursors.DictCursor) a=conn.cursor() sql=’CREATE TABLE `users` (`id` int(11) NOT NULL AUTO_INCREMENT,`email` varchar(255) NOT NULL,`password` varchar(255) … Read more

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