'float' object is not callable

Question

This my code about plotting in python

import pylab as py
def h(t):
return 1.2732*py.sin(2*t)+0.4244*py.sin(6*t)+0.25465*py.sin(10*t)
+0.18189*py.sin(14*t)+0.14147*py.sin(18*t)
def dh(t):
return 2.5464*py.cos(2*t)+2.5464*py.cos(6*t)+2.5464*py.cos(10*t)
+2.5464*py.cos(14*t)+2.5464*py.cos(18*t)
def dh2(t):
return(h(t+h)-h(t))/h
pi=py.pi
a,b,n=-pi,pi,10000
h=(b-a)/(n-1)
ts=py.linspace(a,b,n)
ys=h(ts)
ys1=dh(ts)
ys2=dh2(ts,h)
py.figure(facecolor="w")
py.plot(ts,ys,label="h(t)")
py.plot(ts,ys1,label="exact h'(t)")
py.plot(ts,ys2,label="computed h'(t)")
pylab.xlabel('t')
pylab.ylabel('S')
pylab.grid()
py.title("sawtooth function approximation and derivative")
pylab.show()

The result said:
Traceback (most recent call last):
File "", line 14, in
TypeError: 'float' object is not callable

Please help me, I need to summit my homework by tomorrow

Answer 1

You have both a function h(t) and a global variable h with the same name. After the global variable is defined it overwrites the function and h(t+h) tries to cal the float variable h.

You should rename one of them.