示例代码以下:
s = 'abcdefghijk' #原字符串 l = list(s) #将字符串转换为列表,列表的每个元素为一个字符 l[1] = 'z' #修正字符串的第1个字符为z newS = ''.join(l) #将列表从新衔接为字符串 print(newS)#azcdefghijk #修正后的字符串
字符串格式化与拼接范例
[强迫] 除了a+b这类最简朴的状况外,应当运用%或format格式化字符串。
诠释
庞杂格式化运用%或format更直观
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)
·[强迫] 不要运用+=拼接字符串列表,应当运用join。
诠释
python中字符串是不可修正对象。每次+=会建立一个新的字符串,机能较差。
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>'
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