df ['column name'] .dtype #DataFrame
 np.dtype () #numpy array

 Convert to df ['column name']. astype (int) #int
 Convert to df ['column name']. dtype (float) #float
 df ['column name'] .dtype (str) # Convert to string

df.isnull()

df.dropna()

 df.drop (number of lines)

 df ['new column name'] = [a, b, c, d, ...]

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