[Python] Pandas read_csv: low_memory and dtype options

df = pd.read_csv('somefile.csv')


...gives an error:

.../site-packages/pandas/io/parsers.py:1130: DtypeWarning: Columns (4,5,7,16) have mixed types. Specify dtype option on import or set low_memory=False.
​

Why is the dtype option related to low_memory, and why might low_memory=False help?

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