title: Matplotlib Patches don't have "get_transform" attributes?
body: <p>I'm having trouble trying to map polygon objects onto a world map using matplotlib's PatchCollections (I'm also trying to color each polygon according to a statistic/value I have, but the error occurs before this, so I don't think it is relevant).</p>
  
  <p>I imported matplotlib, PatchCollection, and others as so:</p>
  
  <pre><code>import pandas as pd
  import matplotlib as mpl
  import numpy as np
  from mpl_toolkits.basemap import Basemap
  from matplotlib.patches import Polygon
  from matplotlib.collections import PatchCollection
  mpl.use('TkAgg')
  import matplotlib.pyplot as plt
  import geopandas as gp
  import shapely
  </code></pre>
  
  <p>My data is in a GeoPandas DataFrame called "poly_df".</p>
  
  <p>(Note that I separated out each instance of Multipolygons so each polygon has its own row. For example, Norway has multiple rows in this dataframe rather than one row with a multipolygon in the geometry column, but my problem was occuring even before this.)</p>
  
  <p>poly_df:</p>
  
  <pre><code> countryname, value,  geometry 
   Norway,      10.031, POLYGON ((-9.0430908203125 70.80386352539062, ...
  </code></pre>
  
  <p>When I try to call PatchCollection, after doing things like drawing coastlines etc, like this:</p>
  
  <pre><code>patches = poly_df.geometry.tolist()
  collection = PatchCollection(patches, zorder=5)
  </code></pre>
  
  <p>where each element in this "patches" list is:</p>
  
  <pre><code>&lt;class 'shapely.geometry.polygon.Polygon'&gt;
  </code></pre>
  
  <p>I'm getting this error (geo_plot() is my function where all this is being done):</p>
  
  <pre><code>    Traceback (most recent call last):
    File "labor_participation.py", line 125, in &lt;module&gt;
      geo_plot()
    File "labor_participation.py", line 109, in geo_plot
      collection = PatchCollection(patches, zorder=5)
    File "/Users/Martin/anaconda/lib/python3.5/site-
  packages/matplotlib/collections.py", line 1696, in __init__
      self.set_paths(patches)
    File "/Users/Martin/anaconda/lib/python3.5/site-
  packages/matplotlib/collections.py", line 1700, in set_paths
      for p in patches]
    File "/Users/Martin/anaconda/lib/python3.5/site-
  packages/matplotlib/collections.py", line 1700, in &lt;listcomp&gt;
      for p in patches]
  AttributeError: 'Polygon' object has no attribute 'get_transform'
  </code></pre>
  
  <p>Am I supposed to pass something into PatchCollection() other than the list of Polygon objects that I'm currently trying, and failing, to use? If Polygon objects don't have this attribute - what does? I could really use some guidance, I'm new to geographic data. Thank you.</p>