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df_new1, df_new2 = df[:10, :], df[10:, :] if len(df) > 10 else df, None
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import numpy as np
number_of_parts = 10
parts = np.array_split(df, number_of_parts)
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df = pd.DataFrame({'Sales':[10,20,30,40,50], 'A':[3,4,7,6,1]})
print (df)
A Sales
0 3 10
1 4 20
2 7 30
3 6 40
4 1 50
s = 30
df1 = df[df['Sales'] >= s]
print (df1)
A Sales
2 7 30
3 6 40
4 1 50
df2 = df[df['Sales'] < s]
print (df2)
A Sales
0 3 10
1 4 20