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Clarify Date Format Example #19204

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Dec 30, 2020
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Clarify Date Format Example #19204

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15 changes: 8 additions & 7 deletions examples/text_labels_and_annotations/date.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,29 +39,30 @@
fig, ax = plt.subplots()
ax.plot('date', 'adj_close', data=data)

# Major ticks every 6 months
# Major ticks every 6 months.
fmt_half_year = mdates.MonthLocator(interval=6)
ax.xaxis.set_major_locator(fmt_half_year)

# Minor ticks every month
# Minor ticks every month.
fmt_month = mdates.MonthLocator()
ax.xaxis.set_minor_locator(fmt_month)

# Text in the x axis will be displayed in 'YYYY-mm' format
# Text in the x axis will be displayed in 'YYYY-mm' format.
ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m'))

# Round to nearest years.
datemin = np.datetime64(data['date'][0], 'Y')
datemax = np.datetime64(data['date'][-1], 'Y') + np.timedelta64(1, 'Y')
ax.set_xlim(datemin, datemax)

# Format the coords message box
# Format the coords message box, i.e. the numbers displayed as the cursor moves
# across the axes within the interactive GUI.
ax.format_xdata = mdates.DateFormatter('%Y-%m')
ax.format_ydata = lambda x: '$%1.2f' % x # format the price.
ax.format_ydata = lambda x: f'${x:.2f}' # Format the price.
ax.grid(True)

# rotates and right aligns the x labels, and moves the bottom of the
# axes up to make room for them
# Rotates and right aligns the x labels, and moves the bottom of the
# axes up to make room for them.
fig.autofmt_xdate()

plt.show()