how to select all the monday form "20150101" till "20150620"?

[length power]

import pandas as pd
rng = pd.date_range("20150101","20150620",freq="D")
for day in rng:
   x = pd.to_datetime(day)
   y = x.timetuple().tm_wday
   if(y == 0) :print(x.strftime("%Y%m%d"))


I have selected all  the monday form "20150101" till "20150620",how to make
it more simple?
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