from pathlib import Path
def txt_to_df(str_txt):
# TXTをDataframeに変換する、何らかの処理
return df
txt_path = Path("./txt/")
all_df = pd.DataFrame()
for txt in txt_path.glob("*.txt"):
str_txt = txt.read_text()
df = txt_to_df(str_txt)
all_df = pd.concat([all_df, df])