title: sharey by row in pandas df
body: <p>I use pandas dataframe to plot various histograms with function:</p>
  
  <pre><code>result_number.plot.hist(subplots=True,legend=False, layout=(6,2), bins=35, figsize=(10,13), sort_columns=False, color="gray")
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/pjJDe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pjJDe.png" alt="Chart example"></a></p>
  
  <p>I need to sharey axis in each row by the chart in the left. So in the above image I would like to have on the right side 0/5/10/15 ytickz.</p>
  
  <p>In the second row I would like to have on the right side 0,10,20,30,40 yticks.</p>
  
  <p>I tried following commands, where I put <code>sharey=True</code> or <code>sharey={'row'}</code> but that returns the same image (see img below), with sharedy on all subplots:</p>
  
  <pre><code>result_number.plot.hist(subplots=True,sharey=True, legend=False, layout(6,2), bins=35, figsize=(10,13), sort_columns=False, color="gray")
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/Mf6pM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Mf6pM.png" alt="enter image description here"></a></p>
  
  <p>Minimal dataset to test this issue:</p>
  
  <pre><code>,christofides,NN,CHRST_two_opt,NN_two_opt
  0,1.0535714285714286,1.1160714285714286,1.0,1.0178571428571428
  1,1.0495049504950495,1.1386138613861385,1.0297029702970297,1.0396039603960396
  2,1.1217391304347826,1.1478260869565218,1.0260869565217392,1.1043478260869566
  3,1.1111111111111112,1.1538461538461537,1.0,1.0854700854700854
  4,1.05,1.1416666666666666,1.0166666666666666,1.0333333333333334
  5,1.0925925925925926,1.0925925925925926,1.0462962962962963,1.0185185185185186
  6,1.0377358490566038,1.2264150943396226,1.0188679245283019,1.2075471698113207
  7,1.103448275862069,1.0948275862068966,1.0258620689655173,1.043103448275862
  8,1.0769230769230769,1.1623931623931625,1.0427350427350428,1.1025641025641026
  9,1.09009009009009,1.2072072072072073,1.027027027027027,1.1081081081081081
  10,1.079646017699115,1.336283185840708,1.0265486725663717,1.1327433628318584
  11,1.0932203389830508,1.152542372881356,1.0254237288135593,1.076271186440678
  12,1.0608695652173914,1.1652173913043478,1.0260869565217392,1.0695652173913044
  13,1.0854700854700854,1.1196581196581197,1.0512820512820513,1.017094017094017
  14,1.1441441441441442,1.2792792792792793,1.009009009009009,1.1801801801801801
  15,1.0789473684210527,1.2456140350877194,1.0526315789473684,1.1491228070175439
  16,1.0661157024793388,1.1818181818181819,1.0165289256198347,1.1322314049586777
  17,1.0695652173913044,1.1652173913043478,1.008695652173913,1.0956521739130434
  18,1.0754716981132075,1.1226415094339623,1.028301886792453,1.0566037735849056
  19,1.0442477876106195,1.176991150442478,1.0353982300884956,1.0265486725663717
  </code></pre>