Attempting to plot tick chart gives error <= not supported between instances of 'str' and 'float'

[PythonAI1234]

I downloaded tick data of a weeks worth from dukascopy

After reading the pandas
I did
week_df = pd.concat([df0,df1,df2,df3,df4,df5])
week_df['Open'] = week_df['Bid']
week_df['Close'] = week_df['Bid']
week_df['High'] = week_df['Bid']
week_df['Low'] = week_df['Bid']

week_df = week_df.rename(columns=['Local time':'Date'])
week_df['Date'] = pd.to_datetime(week_df['Date']).view('int64')

ax=fplt.create_plot('tick chart',rows=1)

fplt.candlestick_ochl(week_df[['Date','Close','Open','High','Low']],ax=ax)

fplt.show()

it returns <= not supported between instances of 'str' and 'float'
when comparing
is_up = df[opencol] <= [closecol]

How do you realistically plot a tick chart in this case?

[highfestiva]

For one, this is not the code you're running (as it has syntax errors, and would fail there before trying to plot). Secondly, open, close, high and low needs to be numbers. Not strings.