import os
import numpy as np
import pandas as pd
from os import listdir
path = 'C:/Users/user/Downloads/Merged'
exp_dict=dict()
dirname = os.listdir(path)
for item in dirname:
    with open (item, 'r') as file:
        for line in file:
            i = file.readline().split()
            lvl=float(i[1])
            if lvl>1:
                key = i[0]
                exp_dict[key]=lvl
exp = pd.Series(exp_dict)
expression = pd.DataFrame({'expression': exp})
expression.to_csv('result.csv')

  
>>> ''.split()
[]
>>>