我想学习python，所以我尝试安装python 2.7，但是当我设置环境时，有一个错误告诉语法错误与第一个冒号相反。有人帮帮我吗？
>>> [Environment]::SetEnvironmentVariable("Path", "$env:Path;C:\Python27", "User")
SyntaxError: invalid syntax
答案 0 :(得分：0)
命令#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#define MAXN 5000000
// This is an array of characters:
char c[MAXN];
// This is an array of pointers pointing to individual characters. Essentially, this is an index.
char *a[MAXN];
static int pstrcmp(const void *p1, const void *p2){
// wrapper between strcmp and qsort's compare signature.
// See: man 3 qsort -- http://linux.die.net/man/3/qsort
return strcmp(* (char * const *) p1, * (char * const *) p2);
}
int main() {
int ch;
size_t n = 0;
while ((ch = getchar()) != EOF) {
// In this loop, you systematically build up an index, where a[i] points to c[i].
a[n] = &c[n];
c[n] = ch;
n++;
}
c[n] = 0;
qsort(a, n, sizeof(char *), pstrcmp); // Now, you sort the _index_.
printf("\nc: %s\n", c); // Print Original array.
printf("a: "); // Print Ordered array:
for (size_t i = 0; i < n; i++)
printf("%c", *a[i]); // Look at the indirection
printf("\n");
return 0;
}
不是python命令，而是设置[Environment]::SetEnvironmentVariable("Path", "$env:Path;C:\Python27", "User")变量的操作系统命令。
您在 Python解释器中遇到此错误，该错误由您在终端中输入的命令PATH触发（Windows PowerShell） 。
请注意该行左侧的python。它声明你在 Python解释器
请输入>>>退出 python interpreter ，然后输入命令。它应该工作！