python - Why am I getting the return value of None and what does it mean? -


i no understand well, result: "none". trying start elimination (gauss) code, receive result: "none".

from numpy import * a= array([[1,0],[0,2]]) b= array([1,4])  def gauss(a,b):     n=len(b)      k=0     while k in range (0, n-1):         i=k+1         while in range ((k+1),(n)):             a[i,k]=a[i,k]/a[k,k]             j=k+1             while j in range ((k+1),(n)):                 a[i,j]=a[i,j]-a[i,k]*a[i,k]                 j=j+1             b[i]=b[i]-a[i,k]*b[k]             i=i+1         k=k+1         return         return b   print gauss(a,b)

by default, functions in python return none if there no return statement, or not return value. in case, add return a, b end of function. result gauss(a, b) return tuple (a, b) newly computed values. 

from numpy import * a= array([[1,0],[0,2]]) b= array([1,4])  def gauss(a,b):     n=len(b)      k=0     while k in range (0, n-1):         i=k+1         while in range ((k+1),(n)):             a[i,k]=a[i,k]/a[k,k]             j=k+1             while j in range ((k+1),(n)):                 a[i,j]=a[i,j]-a[i,k]*a[i,k]                 j=j+1             b[i]=b[i]-a[i,k]*b[k]             i=i+1         k=k+1     return a, b  print gauss(a,b)

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