Why do nested if work but no a single liner?

I'm using pandas to read from an excel workbook and extract some data. I have this piece of code in my project:

week_list = []
for index, row in date_sort.iterrows():
    date = row.iloc[1].to_pydatetime()
    cuenta = row.iloc[8]
    if (date >= week):
        if (account == 'office'):
            print(row)
            <do stuff>
    else:
        break

Where row.iloc[1] points to the cell with a date, and row.iloc[8] points to to a cell with a string. The above code works just fine for my purposes. But if I try to write:

if (date >= week and account == 'office'):

instead of

if (date >= week):
            if (account == 'office'):

It skips the if statement all together. What is happening here?