--- begin suprise.py.cry ---
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--- end surprise.py.cry ---
To see the surprise under the Christmas tree:
python pycrypt.py surprise.py.cry
--- begin pycrypt.py ---
#!/usr/local/bin/python
"""Program to artistically encript and decript Python scripts,
according to their file name estension.
Author: M. Simionato - mis6 at pitt.edu"""
usage="""\
Examples of usage:
./pycrypt.py program.py
creates a crypted program.py.cry
./pycrypt.py program.py.cry
decodes and executes program.py.cry
"""
import os,sys
from base64 import encodestring,decodestring
Nrow=50; Ncol=78
class GeometricFigure:
"""This class allows to define geometric figures according to their
equation in the cartesian plane. Moreover addition and subtraction
of geometric figures are defined as union and subtraction of sets.
This program could be useful to teach geometry to students, too :-)
"""
def __init__(self,equation,**parameters):
"Initialize "
self.eq=equation
self.par=parameters
for (k,v) in self.par.items(): #specifies the parameters
self.eq=self.eq.replace(k,str(v))
self.contains=eval('lambda x,y : '+self.eq)
def combine(self,fig,operator):
"""Combine self with the geometric figure fig, using the
operators "or" (addition) and "and not" (subtraction)"""
comboeq="("+self.eq+")"+operator+"("+fig.eq+")"
combopar=fig.par.copy(); combopar.update(self.par)
return GeometricFigure(comboeq,**combopar)
def __add__(self,fig):
"Union of sets"
return self.combine(fig,' or ')
def __sub__(self,fig):
"Subtraction of sets"
return self.combine(fig,' and not')
def format_text(text,fig):
"Format the text in the shape given by fig"
i=0; row=0; L=len(text); EOF=0; out=[]
while not EOF:
for col in range(Ncol):
if fig.contains(col,row):
out.append(text[i]); i+=1
if i==L: EOF=1; break
else: out.append(" ")
out.append('\n'); row+=1
if row==Nrow: row=0
return ''.join(out)
def encript_decript(fname,shape):
"""If file name ends with ".py", encript the text;
otherwise decript and execute it."""
if fname.endswith('.py'): #encode
text=file(fname).read()
text=encodestring(text).replace('\n','\\n')
shaped=format_text(text,shape)
print >> file(fname+'.cry','w'),shaped,
print shaped
print "Written on",fname+".cry"
elif fname.endswith('.cry'): #decode
text=file(fname).read().replace(' ','').replace('\n','')
code=decodestring(text.replace('\\n','\n'))
os.popen('python2','w').write(code) #execute
else:
print "Unrecognized file type.\n",usage
#Library of useful geometric figures; you may want to play with them
bigdisk=GeometricFigure('(x-x0)**2/4+(y-y0)**2 <= R**2',
x0=26,y0=20,R=12) # not used
smalldisk=GeometricFigure('(x-x0)**2/4+(y-y0)**2 <= r**2',
x0=26,y0=20,r=4) # not used
otherdisk=GeometricFigure('(x-x1)**2/4+(y-y0)**2 <= r**2',
x1=68,y0=20,r=4) # not used
square=GeometricFigure('abs(x-x0)/2<L and abs(y-y0)<L',
x0=40,y0=10,L=10) # not used
triangle=GeometricFigure('((x-x0)**2 <= A*(y-ymin)**2 and ymin <= y <= ymax)',
A=.5,ymin=10,ymax=40,x0=40)
rectangle=GeometricFigure('abs(x-x0)/2<Lx and abs(y-y0)<Ly',
x0=40,y0=45,Lx=3,Ly=5)
circle=GeometricFigure('R1**2 <= (x-x0)**2/4+(y-yc0)**2 <= R2**2',
R1=3,R2=4,x0=40,yc0=11)
XmasTree=triangle+rectangle+circle
#Main
if __name__=='__main__':
try: fname=sys.argv[1]
except IndexError: print usage
else: encript_decript(fname,shape=XmasTree)
--- end pycrypt.py ---