how to give a range value for x axis in matplotlib code example

Example 1: how to set axis range matplotlib

# For a given y=time-dependent variable, x=time
fig, ax = plt.subplots(figsize=(12, 6))

ax.plot(y, label='y')
#'lower' is lower limit of the range you wanna set
#'upper' is upper limit of the range you wanna set
plt.xlim(lower, upper)

Example 2: pyplot set x range

fig, ax = plt.subplots(figsize=(12, 6))

x = np.arange(0, 10, 0.1)
y = np.sin(x)
z = np.cos(x)

ax.plot(y, color='blue', label='Sine wave')
ax.plot(z, color='black', label='Cosine wave')

plt.xlim([25, 50])
plt.show()