IgraMaga YT

from openpyxl import load_workbook

wb = load_workbook('file.xlsx')
sheet_ranges = wb['List1']
column_b = sheet_ranges['B']

for i in range(len(column_b)): 
    print(column_b[i].value)

# Или просто как итератор перебрать столбец:
for cell in column_b:
    print(cell.value)

@bot.command()
async def edit(ctx,*, msg=None):
    ch = channel.id
    ch.edit(content = f'{msg}')