if len(L)==0:
return(None,None)
imax=L[0]
imin=L[0]
for v in L:
if imax<v:
imax=v
if imin>v:
imin=v
print(imin,imax)
return (imin, imax)
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if len(L)==0:
return(None,None)
imax=L[0]
imin=L[0]
for v in L:
if imax<v:
imax=v
if imin>v:
imin=v
print(imin,imax)
return (imin, imax)