Nice! And thanks for sum(**_i%7>4_** ....) I have to improve my solution: checkio=lambda a,b: sum(i%7>4 for i in range(a.weekday(),(b-a).days+a.weekday()+1)) More

return '(x-{})^2+(y-{})^2={}^2'.format(*map(format, (x, y, r))) No need to use format function here. Solution is %.3g '(x-%.3g)^2+(y-%.3g)^2=%.3g^2'%(x,y,r) More