Bug report

Bug summary

I have more than 10 majorTicks on the X-axis. label1On is False for each of the odd numbered majorTicks. Call tick_params as shown in subject and label1On is True for all MajorTick members after return.

Code for reproduction

major_ticks = axis.xaxis.get_major_ticks()
    if len(major_ticks) > 10:
        for i, tick in enumerate(major_ticks):
            if (i % 2) == 1:
                tick.label1On = False
logger.info("the value  of label1O is %r", axis.xaxis.majorTicks[1].label1On)
axis.tick_params(axis='both', which='major', length=5)
logger.info("the value  of label1O is %r", axis.xaxis.majorTicks[1].label1On)

Actual outcome

2019-01-18 16:42:28,509 - unavco.plotter.posfile - INFO - the value  of label1O is False
2019-01-18 16:42:36,626 - unavco.plotter.posfile - INFO - the value  of label1O is True

Expected outcome

I expected the value of label1On to not change.
Use to work with version 1.2.0 and python 2.7

Matplotlib version

• Operating system: Mac OS High Sierra
• Matplotlib version: 3.0.2
• Matplotlib backend (print(matplotlib.get_backend())): MacOSX
• Python version: 3.7
• Jupyter version (if applicable):
• Other libraries:

yum install after install python 3.6