后端开发|Python教程
python,数字变量
后端开发-Python教程
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。
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函数如下：
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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
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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 "", line 1, in 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, b).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 osimport sysstr1=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_splitprint (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)]
