m=[31,29,31,30,31,30,31,31,30,31,30,31]
a=3
for i in range(12):
s=[" "]*a
for j in range(m[i]):
s+=[("%2d"%-~j)];a+=1
x=" "+" ".join(s)
if a%7==0:print x;s=[];p=""
else:p=x+"\n"
print p
a%=7
Note that non-ascii characters in the above source code will be escaped (such as \x9f).