Type Error in Python

[MarcusB]

Why do I get
"TypeError: can't multiply sequence by non-int of type 'float'" with the code below?

#add ranges to list of tuple pairs
ranges = []
a_values = []
b_values = []

for x in params:
    a = min(df[params][x])
    a = a - (a*.25)
    
    b = max(df[params][x])
    b = b + (b*.25)
    
    ranges.append((a,b))
    
for x in range(len(df['Player'])):
    if df['Player'][x] == 'Bruno Fernandes':
        a_values = df.iloc[x].values.tolist()
    if df['Player'][x] == 'K. De Bruyne':
        b_values = df.iloc[x].values.tolist()
        
a_values = a_values[1:]
b_values = b_values[1:]

values = [a_values,b_values]

buran write Mar-30-2021, 06:17 PM:
Please, use proper tags when post code, traceback, output, etc. This time I have added tags for you.
See BBcode help for more info.

[buran]

what is df? what is params? Also post full traceback in error tags.

[MarcusB]

what is df? what is params? Also post full traceback in error tags.

Sorry, I'm very new to this whole coding thing. Df = Data frame. Params = Parameters

Full traceback: ---------------------------------------------------------------------------

Error:
TypeError                                 Traceback (most recent call last)
<ipython-input-10-6c367cbca7e0> in <module>
      6 for x in params:
      7     a = min(df[params][x])
----> 8     a = a - (a*.25)
      9 
     10     b = max(df[params][x])

TypeError: can't multiply sequence by non-int of type 'float'

buran write Mar-30-2021, 06:34 PM:
Please, use proper tags when post code, traceback, output, etc. This time I have added tags for you.
See BBcode help for more info.

[buran]

Df = Data frame. Params = Parameters

We can guess that. The question is what are their values.