python中正确的字符串编码规范

s = 'abcdefghijk' #原字符串
l = list(s) #将字符串转换为列表，列表的每一个元素为一个字符
l[1] = 'z' #修改字符串的第1个字符为z
newS = ''.join(l) #将列表重新连接为字符串
print(newS)#azcdefghijk 
#修改后的字符串

Yes: x = a + b
     x = '%s, %s!' % (imperative, expletive)
     x = '{}, {}!'.format(imperative, expletive)
     x = 'name: %s; score: %d' % (name, n)
     x = 'name: {}; score: {}'.format(name, n)
No:  x = '%s%s' % (a, b)  # use + in this case
     x = '{}{}'.format(a, b)  # use + in this case
     x = imperative + ', ' + expletive + '!'
     x = 'name: ' + name + '; score: ' + str(n)

Yes: items = ['<table>']
     for last_name, first_name in employee_list:
         items.append('<tr><td>%s, %s</td></tr>' % (last_name, first_name))
     items.append('</table>')
     employee_table = ''.join(items)
No:  employee_table = '<table>'
     for last_name, first_name in employee_list:
         employee_table += '<tr><td>%s, %s</td></tr>' % (last_name, first_name)
     employee_table += '</table>'