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The error says it all: in Python, the indentation is very important. In your case, the return s should start at the same text column than for l in range(g.nrows()):

In general, it is advised to indent with 4 spaces, so, your code should look like:

sage: def christoffel(i,j,k,vars,g):
....:     s = 0
....:     ginv = g^(-1)
....:     for l in range(g.nrows()):
....:         s = s + (1/2)*ginv[k,l]*(g[j,l].diff(vars[i])+g[i,l].diff(vars[j])-g[i,j].diff(vars[l]))
....:     return s

The error says it all: all (IndentationError) : in Python, the indentation is very important. In your case, the return s should start at the same text column than for l in range(g.nrows()):

In general, it is advised to indent with 4 spaces, so, your code should look like:

sage: def christoffel(i,j,k,vars,g):
....:     s = 0
....:     ginv = g^(-1)
....:     for l in range(g.nrows()):
....:         s = s + (1/2)*ginv[k,l]*(g[j,l].diff(vars[i])+g[i,l].diff(vars[j])-g[i,j].diff(vars[l]))
....:     return s