Discoveries in Python Libraries

[Ioncubekh]

Here I will discuss findings about python libraries & stuff

Python <> HPPL variables https://www.hpmuseum.org/forum/thread-18996.html

For matplotl https://www.hpmuseum.org/forum/thread-18992.html

For linalg https://www.hpmuseum.org/forum/thread-16897.html

Creating / saving / accessing files via python program (Python APP is active)

File created below is listed in CAS using AFiles(); but contents not accessed via AFiles("dict.txt")

Code:


from uio import *
# python dictionary with key value pairs
dict = {'Python' : '.py', 'C++' : '.cpp', 'Java' : '.java'}
# open file for writing, "w" 
# f type is TextIOWrapper
f = open("dict.txt","w")
# write file
f.write( str(dict) )
# close file
f.close()

Accessing / Reading files is OK from python. Weird thing is that file once read is automatically closed? Once you have issued readlines(), the 2nd time you do it no data is returned. File should remain open till .close()

Code:


f = open("dict.txt","r")
f.readlines() #dumps all file contents on terminal
f.readlines() #no data ???

Regarding CAS in python; xcas seems working. As expected it accepts a valid string because the following operation yield proper results even without importing math or cmath libraries for cos() sin()

Code:


from cas import *
xcas(' int(cos(x) ')
xcas(' diff(sin(x) ')
eval_expr(' solve(3*x+2=9) ')