<human>:  plot use default yaxis limits.
<bot>: Here is a Python function to plot using default yaxis limits

import matplotlib.pyplot as plt

def _set_default_yaxis_limits(ax):
  """
  Set the default yaxis limits for the given axis.
  """
  ax.set_ylim(bottom=0, top=1)

# Enter the axis
ax = plt.gca()

# Calling the function
print((_set_default_yaxis_limits(ax)))

#Example Output
# None

#Remember to inspect code for bugs.