在編寫python函數時，無意中發現一個問題：python中的變量不能以數字打頭，以下函數中定義了一個變量3_num_varchar，執行時報錯。
函數如下：
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
報錯信息如下：
>>> 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:\Python33\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 699, in runfile
execfile(filename, namespace)
File "D:\Python33\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.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
將變量3_num_varchar改為num_varchar_3，運行成功，程序改為如下：
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))
運行結果：
>>> runfile('E:/procedure/python/projects/others/table_test.py', wdir='E:/procedure/python/projects/others')
The feild type is not varchar
['aaa', 'varchar(10)']