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 | 1 | initial version |
Toy solution :
Create an example :
sage: # Let's generate (the string representation of) a large integer sage: foo=str(frac(pi).n(digits=3000)) sage: # Put that (except the initial "0.") on a file sage: f=open("pifrac.txt", "w", encoding="utf8") sage: f.write("%s\n"%foo[2:]) 3001 sage: f.close()
Read that string :
sage: # Read that back in a string sage: f=open("pifrac.txt", "r", encoding="utf8") sage: bar=f.readline() sage: f.close()
Convert it :
sage: gee=eval("Integer(%s)"%bar)
Check it :
sage: # What's that ? sage: type(gee) <class 'sage.rings.integer.integer'=""> sage: # Magnitude ? sage: gee.log(10).n() 2999.15104072095
Check again :
sage: (frac(pi).n(digits=3000)-gee*1e-3000).log(10) -infinity
Right...
HTH,
| | 2 | No.2 Revision |
Toy solution :
Create an example :
sage: # Let's generate (the string representation of) a large integer sage: foo=str(frac(pi).n(digits=3000)) sage: # Put that (except the initial "0.") on a file sage: f=open("pifrac.txt", "w", encoding="utf8") sage: f.write("%s\n"%foo[2:]) 3001 sage:f.close()-
Read that string :
sage: # Read that back in a string sage: f=open("pifrac.txt", "r", encoding="utf8") sage: bar=f.readline() sage:f.close() -
Convert it :
sage:gee=eval("Integer(%s)"%bar) -
Check it :
sage: # What's that ? sage: type(gee) <class'sage.rings.integer.integer'="">'sage.rings.integer.Integer'> sage: # Magnitude ? sage: gee.log(10).n()2999.15104072095 -
Check again :
sage: (frac(pi).n(digits=3000)-gee*1e-3000).log(10)-infinity
f.close()
f.close()
gee=eval("Integer(%s)"%bar)
2999.15104072095
-infinity
Right...
HTH,
