pydemo | Python code demonstration console for didactic purposes | Interpreter library

by pablito56 Python Version: Current License: No License

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kandi X-RAY | pydemo Summary

pydemo is a Python library typically used in Utilities, Interpreter applications. pydemo has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

pydemo provides a command line interpreter which emulates the behavior of the interactive Python interpreter. In addition, it can read files Python files and execute them by blocks. The CLI processes all the files and splits them in code blocks. A certain number of empty lines in files (1 by default) are used to identify the boundaries between blocks, although they are also validated to verify that they are syntactically correct. In negative case, next lines are added until the accumulated block is right. Each time no text is introduced in the CLI (just pressing ENTER key) a new block is executed. It is print (with syntax highlighted if Pygments is installed) and then it is evaluated inside the CLI, so that in next command you may use objects instantiated inside the code block.

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Support

pydemo has a low active ecosystem.

It has 9 star(s) with 7 fork(s). There are 1 watchers for this library.

It had no major release in the last 6 months.

pydemo has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of pydemo is current.

Quality

pydemo has no bugs reported.

Security

pydemo has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

pydemo does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

pydemo releases are not available. You will need to build from source code and install.

Build file is available. You can build the component from source.

Installation instructions, examples and code snippets are available.

Top functions reviewed by kandi - BETA

kandi has reviewed pydemo and discovered the below as its top functions. This is intended to give you an instant insight into pydemo implemented functionality, and help decide if they suit your requirements.

Push the given line to the console .
Returns a list of code blocks
Parse command line arguments .
Generate a demo history console .
Get requirements from requirements . txt
Initialize history .
Replace readline .
Example demo .
Initialize the console .

Get all kandi verified functions for this library.

pydemo Key Features

No Key Features are available at this moment for pydemo.

pydemo Examples and Code Snippets

No Code Snippets are available at this moment for pydemo.

Community Discussions

Trending Discussions on pydemo

Can getline() be used multiple times within a loop? - Cython, file reading

QUESTION

Can getline() be used multiple times within a loop? - Cython, file reading

Asked 2021-May-25 at 14:19

I want to read a file, 4 lines by 4 (it's a fastq file, with DNA sequences).
When I read the file one line by one or two by two, there's no issues, but when I read 3 or 4 lines at once, my code crashes (kernel appeared to have died on jupyter notebook). (Uncommenting the last part, or any 3 out of the 4 getline().
I tried with a double array of char (char**) to store the lines, with the same issue.

Any idea what can be the cause ?

Using Python 3.7.3, Cython 0.29, all other libraries updated. File being read is about 1.3GB, machine has 8GB, ubuntu 16.04. Code adapted from https://gist.github.com/pydemo/0b85bd5d1c017f6873422e02aeb9618a

...

ANSWER

Answered 2021-Apr-26 at 11:27

The underlying problem was my misunderstanding of getline() getline() c reference

To store lines in different variables, an associated n is necessary for each line pointer *lineptr.

If *lineptr is set to NULL and *n is set 0 before the call, then getline() will allocate a buffer for storing the line.

Alternatively, before calling getline(), *lineptr can contain a pointer to a malloc(3)-allocated buffer *n bytes in size. If the buffer is not large enough to hold the line, getline() resizes it with realloc(3), updating *lineptr and *n as necessary.

The n (or seed in my code) will hold the size of the buffer allocated for the pointer, where getline() puts the incoming line. As I set the same buffer variable for different pointers, getline was given the wrong information of the size of the char* line_xxx.

As fastq files are usually in this shape:

Source https://stackoverflow.com/questions/67257960

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install pydemo

Download the code and execute python setup.py install. After installation you will have a pydemo command available.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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