[Python] group by week in pandas

I'm having this data frame:

Name Date Quantity
Apple 07/11/17 20
orange 07/14/17 20
Apple 07/14/17 70
Orange 07/25/17 40
Apple 07/20/17 30


I want to aggregate this by Name and Date to get sum of quantities Details:

Date: Group, the result should be at the beginning of the week (or just on Monday)

Quantity: Sum, if two or more records have same Name and Date (if falls on same interval)

The desired output is given below:

Name Date Quantity
Apple 07/10/17 90
orange 07/10/17 20
Apple 07/17/17 30
orange 07/24/17 40

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