在编写python函数时，无意中发现一个问题：python中的变量不能以数字打头，以下函数中定义了一个变量3_num_varchar，执行时报错。

函数如下：

def database_feild_varchar_trans(in_feild):
  '''
  transfer the feild if varchar then 3times lang else no transfer
  '''
  feild_split = in_feild.split(' ')
  is_varchar = feild_split[1].find('VARCHAR')
  if is_varchar >= 0 :
    num_varchar = feild_split[1].replace('VARCHAR','').replace('(','').replace(')','') 
    print (num_varchar)
    3_num_varchar = num_varchar*3
    feild_split[1] = feild_split[1].replace(str(num_varchar),str(3_num_varchar))
    return feild_split
  else:
    print ('The feild type is not varchar')
    return feild_split

报错信息如下：

>>> runfile('E:/procedure/python/projects/others/table_test.py', wdir='E:/procedure/python/projects/others')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "D:Python33libsite-packagesspyderlibwidgetsexternalshellsitecustomize.py", line 699, in runfile
  execfile(filename, namespace)
 File "D:Python33libsite-packagesspyderlibwidgetsexternalshellsitecustomize.py", line 88, in execfile
  exec(compile(open(filename, 'rb').read(), filename, 'exec'), namespace)
 File "E:/procedure/python/projects/others/table_test.py", line 20
  3_num_varchar = int(num_varchar)*3
        ^
SyntaxError: invalid syntax

将变量3_num_varchar改为num_varchar_3，运行成功，程序改为如下：

import os
import sys
str1='aaa varchar(10)'

def database_feild_varchar_trans(in_feild):
  '''
  transfer the feild if varchar then 3times lang else no transfer
  '''
  feild_split = in_feild.split(' ')
  is_varchar = feild_split[1].find('VARCHAR')
  if is_varchar >= 0 :
    num_varchar = feild_split[1].replace('VARCHAR','').replace('(','').replace(')','') 
    print (num_varchar)
    num_varchar_3 = num_varchar*3
    feild_split[1] = feild_split[1].replace(str(num_varchar),str(num_varchar_3))
    return feild_split
  else:
    print ('The feild type is not varchar')
    return feild_split

print (database_feild_varchar_trans(str1))

运行结果：

>>> runfile('E:/procedure/python/projects/others/table_test.py', wdir='E:/procedure/python/projects/others')
The feild type is not varchar
['aaa', 'varchar(10)']

以上这篇python变量不能以数字打头详解就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持积木网。

对于Python中RawString的理解介绍
总结1、'''作用:可以表示"多行注释"、"多行字符串"、"其内的单双引号不转义"2、r代表的意思是:raw3、r只对其内的反斜杠起作用(注意单个的问题)rawstring

全面了解python字符串和字典
很多序列的方法字符串同样适用，但是，字符串是不可变的，所以一些试图改变字符串的方法是不可用的1字符串格式化1）用元组或者字典格式化字符串

Python处理json字符串转化为字典的简单实现
今天一个朋友给个需求：来来{'isOK':1,'isRunning':None,'isError':None}怎么转换成字典好，一看就是json转化很简单，开始：importjsona="{'isOK':1,'isRunning':None,'isError'