python故障报错

用另一个文件写好放进来的，结果报错，不知道错在哪里了，求各位帮忙给看看。

df['Sizetype'] = None 

for i in range(len(df)):
    size = df.loc[i,'Size'] 
    if size<=50:
        df.loc[i,'Sizetype'] = "Mini Small"
    elif size<=100:
        df.loc[i,'Sizetype'] = "Small"
    elif size<=150:
        df.loc[i,'Sizetype'] = "Mediumn"
    elif size<=200:
        df.loc[i,'Sizetype'] = "Big"
    else:
        df.loc[i,'Sizetype'] = "Huge"

报错比较多，你把原文件发给我