def read_lines():
readFileName = "readfile.txt"
f = open(readFileName, 'r+')
contents = f.read()
... # and so on
read_lines()
Run Code Online (Sandbox Code Playgroud)
当我运行它时,我收到一个错误:
f = open(readFileName, 'r+')
UnboundLocalError: local variable 'open' referenced before assignment
Run Code Online (Sandbox Code Playgroud) 例如:
file1.c
具有:
static const struct
{
int a;
int b;
int c;
} mystruct = { 1, 2, 3};
Run Code Online (Sandbox Code Playgroud)
file2.c
具有:
#include <stdio.h>
#include "file1.c"
Run Code Online (Sandbox Code Playgroud)
等等.
这样可以吗?
鉴于这个宏:
#define SOME_MACRO(ret, f, args) \
typedef ret (*some_func_##f) args; \
static some_func_##f my_func_##f = NULL;
Run Code Online (Sandbox Code Playgroud)
请让我知道相应的:
SOME_MACRO(void, myFunctionName, (int a));
Run Code Online (Sandbox Code Playgroud)
谢谢.
void testFunc();
int myval = 0;
int main()
{
int a = 1;
if (a > 0)
{
#define TEST1
testFunc();
#undef TEST1
}
int b = 2;
if ( b > 0)
{
#define TEST2
testFunc();
#undef TEST2
}
std::cout << "val : " << myval << endl;
getchar();
return 0;
}
void testFunc()
{
#ifdef TEST1
#define HERE 1
#endif
#ifdef TEST2
#define HERE 2
#endif
#ifdef HERE
myval = HERE;
#else
myval = -1;
#endif
}
Run Code Online (Sandbox Code Playgroud)
如何在第一次调用 …
请告诉我是否有一种方法可以在Linux上批量运行多个python脚本,就像在Windows上使用.bat文件批量运行多个python脚本的方式一样?谢谢.