rguwu.py

# with open(r'C:\Users\Administrator\Desktop\tt.txt','w',encoding='utf-8')as a:
#     a.write("额度色发发发")
with open(r'C:\Users\Administrator\Desktop\tt.txt','r',encoding='utf-8')as a:
    b=a.read()
    if "色" in b:
        t=b.replace('色','过')
with open(r'C:\Users\Administrator\Desktop\tt.txt','w',encoding='utf-8')as a:    
    a.write(t)