Terminal Cruise

Python for all your linear algebra homework:

#!/usr/bin/env python3
import sys,ast,numpy as np
a=np.array(ast.literal_eval(sys.argv[1]))
print("Matrix:")
print(np.matrix(a))
print("\nTranspose:")
print(np.matrix(a.T))
print("\nTrace:",a.trace())
print("\nRank:",np.linalg.matrix_rank(a))
if a.shape[0]==a.shape[1]:
    print("\nDeterminant:",round(np.linalg.det(a),6))
    d,e=np.linalg.eig(a)
    print("\nEigenvalues:",np.round(d,6))
    print("\nEigenvectors:")
    print(np.round(e,6))
print("\nPseudo-inverse:")
print(np.matrix(np.linalg.pinv(a)))

Convert text to italics with Python

#!/usr/bin/env python3
import sys
a="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
b="𝘈𝘉𝘊𝘋𝘌𝘍𝘎𝘏𝘐𝘑𝘒𝘓𝘔𝘕𝘖𝘗𝘘𝘙𝘚𝘛𝘜𝘝𝘞𝘟𝘠𝘡𝘢𝘣𝘤𝘥𝘦𝘧𝘨𝘩𝘪𝘫𝘬𝘭𝘮𝘯𝘰𝘱𝘲𝘳𝘴𝘵𝘶𝘷𝘸𝘹𝘺𝘻"
print(" ".join(sys.argv[1:]).translate(str.maketrans(a,b)))

Find anagrams with Python

#!/usr/bin/env python3
from collections import Counter
import sys,os
s=sys.argv[1]
def anagrams(word,words):
    cw=Counter(word)
    return [w for w in words if Counter(w)==cw]
base=os.path.dirname(os.path.abspath(__file__))
path=os.path.join(base,"words.txt")
with open(path) as f:
    lines=f.read().splitlines()
print(anagrams(s,lines))

Solve quadratic equations with impunity using Python (and complex numbers)

#!/usr/bin/env python3
import math,sys
a,b,c=map(float,sys.argv[1:])
d=b*b-4*a*c
if d>=0:x1=(-b+math.sqrt(d))/(2*a);x2=(-b-math.sqrt(d))/(2*a)
else:r=-b/(2*a);i=math.sqrt(-d)/(2*a);x1,x2=complex(r,i),complex(r,-i)
print("The function has","two real roots: {} and {}".format(x1,x2)if d>0 else
"one double root: {}".format(x1)if d==0 else
"two complex roots: {} and {}".format(x1,x2))

Print the shortest and longest verses in the Bible with Python

#!/usr/bin/env python3
import os
base=os.path.dirname(os.path.abspath(__file__))
path=os.path.join(base,"kjv.txt")
with open(path) as f:
    print("Shortest verse:",min(f,key=len))
with open(path) as f:
    print("Longest verse:",max(f,key=len))

#!/usr/bin/env python3
import matplotlib.pyplot as p,numpy as n
x,y=n.meshgrid(n.linspace(-4,4,512),n.linspace(-4,4,512))
z=(1-x/2+x**4+y**3)*n.exp(-x**2-y**2)*(1-x/3-y**4)*(3-y+x**2)
z+=.5*n.sin(.8*x+.6*y)+.4*n.cos(.5*x-.7*y)+.3*n.sin(.6*x-.4*y)
p.contour(x,y,z,levels=n.linspace(z.min(),z.max(),25),cmap='terrain')
p.show()

#!/usr/bin/env python3
from datetime import*
t=datetime.today()
print("Only",(datetime(t.year,12,25)-t).days,"shopping days until Christmas.")

teresita:Desktop$ seq 3 | paste -sd* | bc

6

teresita:Desktop$ seq 30 | paste -sd* | bc

265252859812191058636308480000000

teresita:Desktop$ seq 300 | paste -sd* | bc

306057512216440636035370461297268629388588804173576999416776741259476533176716867465515291422477573349939147888701726368864263907759003154226842927906974559841225476930271954604008012215776252176854255965356903506788725264321896264299365204576448830388909753943489625436053225980776521270822437639449120128678675368305712293681943649956460498166450227716500185176546469340112226034729724066333258583506870150169794168850353752137554910289126407157154830282284937952636580145235233156936482233436799254594095276820608062232812387383880817049600000000000000000000000000000000000000000000000000000000000000000000000000

Rot13 with Python

#!/usr/bin/python3
import sys, string
def rot13(s):
    return ''.join([chr(x.islower() and ((ord(x) - 84) % 26) + 97
                        or x.isupper() and ((ord(x) - 52) % 26) + 65
                        or ord(x))
                    for x in s])
for line in sys.stdin:
    sys.stdout.write(rot13(line))