CLN: remove compat.iteritems

[topper-123]

• xref CLN: remove PY2 #25725
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff

Removes compat.iteritems.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@190a69e). Click here to learn what that means.
The diff coverage is 21.87%.

@@            Coverage Diff            @@
##             master   #26079   +/-   ##
=========================================
  Coverage          ?   40.74%           
=========================================
  Files             ?      175           
  Lines             ?    52505           
  Branches          ?        0           
=========================================
  Hits              ?    21394           
  Misses            ?    31111           
  Partials          ?        0

Flag	Coverage Δ
#single	40.74% <21.87%> (?)

Impacted Files	Coverage Δ
pandas/io/packers.py	14.53% <ø> (ø)
pandas/compat/__init__.py	69.73% <ø> (ø)
pandas/core/base.py	33.92% <0%> (ø)
pandas/util/testing.py	48.26% <0%> (ø)
pandas/core/arrays/categorical.py	41.43% <0%> (ø)
pandas/core/computation/align.py	18.47% <0%> (ø)
pandas/core/groupby/groupby.py	24.48% <0%> (ø)
pandas/util/_doctools.py	12.87% <0%> (ø)
pandas/core/generic.py	37.84% <0%> (ø)
pandas/core/reshape/melt.py	13.33% <0%> (ø)
... and 16 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@190a69e). Click here to learn what that means.
The diff coverage is 89.23%.

@@            Coverage Diff            @@
##             master   #26079   +/-   ##
=========================================
  Coverage          ?   91.94%           
=========================================
  Files             ?      175           
  Lines             ?    52430           
  Branches          ?        0           
=========================================
  Hits              ?    48207           
  Misses            ?     4223           
  Partials          ?        0

Flag	Coverage Δ
#multiple	90.5% <87.69%> (?)
#single	40.73% <23.07%> (?)

Impacted Files	Coverage Δ
pandas/io/packers.py	88.08% <ø> (ø)
pandas/compat/__init__.py	93.1% <ø> (ø)
pandas/util/_doctools.py	12% <0%> (ø)
pandas/plotting/_core.py	83.76% <0%> (ø)
pandas/core/base.py	97.99% <100%> (ø)
pandas/util/testing.py	90.61% <100%> (ø)
pandas/io/html.py	92.64% <100%> (ø)
pandas/core/arrays/categorical.py	95.96% <100%> (ø)
pandas/core/computation/align.py	97.8% <100%> (ø)
pandas/core/groupby/groupby.py	97.22% <100%> (ø)
... and 16 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[topper-123]

The Travis error is a ResourceWarning: ResourceWarning: unclosed file <_io.TextIOWrapper name=0 mode='r' encoding='UTF-8'>, All other stuff passes.

[gfyoung]

Thanks @topper-123 !