Question:
I am having an issue where I am running a diagnostic script on a headless virt machine. In the code I am generating a set of plots relating to individual objects (containing target data). Calling ax.plot_date(x_vals, y_vals) is causing subplots to envoke tcl for display when there is no display available causing an error (see error below).
I would like to use same code, but not generate a plot to display and finally save fig.savefig(filepath). Any and all assistance would be much appreciated!
I am even open to alternate more efficient methods so feel free to provide that as well.
Code Example:
import matplotlib.pyplot as plt
from matplotlib.dates import drange
from datetime import timedelta
# Code...
# Setup
delta = timedelta(minutes=1)
dates = drange(requested_start, requested_end, delta)
for obj in obj_set:
# Create Plot
fig, ax = plt.subplots()
fig.suptitle('Title', fontsize=10)
plt.xlabel('Time', fontsize=10)
ax.set_xlim(dates[0], dates[-1])
ax.fmt_xdata = DateFormatter('%Y-%m-%d %H:%M:%S')
ax.plot_date(dates, obj.data_set) #Here is command that I would like assistance
fig.autofmt_xdate()
# Setup file information local storage
file_name = '%s.png' % (self.name)
file_path = os.path.join(outdir, 'plots', file_name)
fig.savefig(file_path)
plt.close(fig)
Error Received:
TclError: no display name and no $DISPLAY environment variable
