python这个代码有错误，请帮我修改

file_name = '01.txt'
file = open(str(file_name),'r')
print(file)
str = file.replace(',','')
str1 = str.replace('.','')
danci_lb = str1.split(' ')
file = open(file_name,'w')
file.write(danci_lb)
file.close()
#错误

file_name = '01.txt'
file = open(str(file_name), 'r')
print(file)
strs = file.read().replace(',', '')
str1 = strs.replace('.', '')
danci_lb = str1.split(' ')
file.close()
file = open(file_name, 'w')
file.write(str(danci_lb))
file.close()

或者

file_name = '01.txt'
file = open(str(file_name), 'r')
strs = file.read()
strs = strs.replace(',', '')
str1 = strs.replace('.', '')
danci_lb = str1.split(' ')
file.close()
file = open(file_name, 'w')
file.write(''.join(danci_lb))
file.close()

file_name = '01.txt'
file = open(str(file_name), 'r')
txt = file.read()
print(txt)
str = txt.replace(',', '')
str1 = str.replace('.', '')
danci_lb = str1.split(' ')
file.close()
file = open(file_name, 'w')
file.write(''.join(danci_lb))
file.close()