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Fix SettingWithCopyWarning
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@c-martinez
c-martinez committed Mar 31, 2015
1 parent 96d2e53 commit 2bdaa81
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Showing 3 changed files with 2,222 additions and 2,358 deletions.
127 changes: 34 additions & 93 deletions ...apter 4 - Find out on which weekday people bike the most with groupby and aggregate.ipynb
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"berri_bikes = bikes[['Berri 1']]"
"berri_bikes = bikes[['Berri 1']].copy()"
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"/usr/local/lib/python2.7/dist-packages/pandas/core/indexing.py:245: SettingWithCopyWarning: \n",
"A value is trying to be set on a copy of a slice from a DataFrame.\n",
"Try using .loc[row_indexer,col_indexer] = value instead\n",
"\n",
"See the the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy\n",
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" parse_dates=['Date'], dayfirst=True, \n",
" index_col='Date')\n",
"# Add the weekday column\n",
"berri_bikes = bikes[['Berri 1']]\n",
"berri_bikes = bikes[['Berri 1']].copy()\n",
"berri_bikes.loc[:,'weekday'] = berri_bikes.index.weekday\n",
"\n",
"# Add up the number of cyclists by weekday, and plot!\n",
"weekday_counts = berri_bikes.groupby('weekday').aggregate(sum)\n",
"weekday_counts.index = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']\n",
"weekday_counts.plot(kind='bar')"
]
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