输出看上去像这样: 250-server1.crazytechgeek.info250-PIPELINING250-SIZE10240000250-VRFY250-ETRN250-STARTTLS250-ENHANCEDSTATUSCODES250-8BITMIME250-DSN250SMTPUTF8 接下来,运行橙色高亮的命令,例如 mail from、rcpt to、data,最后输入 quit: mailfrom:<pkumar>2502.1.0Ok rcpt to:<postfixuser>2502.1.5Ok d...
在python中评估后缀?我想编写一个函数来评估作为列表传递的后缀表达式。到目前为止,我有: def evalPostfix(text): s = Stack() for symbol in text: if symbol in "0123456789": s.push(int(symbol)) if not s.is_empty(): if symbol == "+": plus = s.pop() + s.pop() if symbol == "-"...
g to a variable x. In lisp, we would write “((Deriv f) x)â€.In Mathematica, we would write “Deriv[f][x]â€. In lisp's version, the nesting corresponds to the logics of the evaluation. In the Mathematica's form, the logics of the evaluatio...