@ -1387,7 +1387,6 @@ LogicOp = enum.Enum(<span class="hljs-string">'LogicOp'</span>, {<span
last_el = op.methodcaller(< span class = "hljs-string" > 'pop'< / span > )(< list> )
< / code > < / pre >
< h2 id = "eval" > < a href = "#eval" name = "eval" > #< / a > Eval< / h2 >
< h3 id = "basic" > Basic< / h3 >
< pre > < code class = "python language-python hljs" > < span class = "hljs-meta" > > > > < / span > < span class = "hljs-keyword" > from< / span > ast < span class = "hljs-keyword" > import< / span > literal_eval
< span class = "hljs-meta" > > > > < / span > literal_eval(< span class = "hljs-string" > '1 + 2'< / span > )
< span class = "hljs-number" > 3< / span >
@ -1396,47 +1395,6 @@ last_el = op.methodcaller(<span class="hljs-string">'pop'</span>)(<l
< span class = "hljs-meta" > > > > < / span > literal_eval(< span class = "hljs-string" > 'abs(1)'< / span > )
ValueError: malformed node < span class = "hljs-keyword" > or< / span > string
< / code > < / pre >
< h3 id = "usingabstractsyntaxtrees" > Using Abstract Syntax Trees< / h3 >
< pre > < code class = "python language-python hljs" > < span class = "hljs-keyword" > import< / span > ast
< span class = "hljs-keyword" > from< / span > ast < span class = "hljs-keyword" > import< / span > Num, BinOp, UnaryOp
< span class = "hljs-keyword" > import< / span > operator < span class = "hljs-keyword" > as< / span > op
LEGAL_OPERATORS = {ast.Add: op.add, < span class = "hljs-comment" > # < el> + < el> < / span >
ast.Sub: op.sub, < span class = "hljs-comment" > # < el> - < el> < / span >
ast.Mult: op.mul, < span class = "hljs-comment" > # < el> * < el> < / span >
ast.Div: op.truediv, < span class = "hljs-comment" > # < el> / < el> < / span >
ast.Pow: op.pow, < span class = "hljs-comment" > # < el> ** < el> < / span >
ast.BitXor: op.xor, < span class = "hljs-comment" > # < el> ^ < el> < / span >
ast.USub: op.neg} < span class = "hljs-comment" > # - < el> < / span >
< span class = "hljs-function" > < span class = "hljs-keyword" > def< / span > < span class = "hljs-title" > evaluate< / span > < span class = "hljs-params" > (expression)< / span > :< / span >
root = ast.parse(expression, mode=< span class = "hljs-string" > 'eval'< / span > )
< span class = "hljs-keyword" > return< / span > eval_node(root.body)
< span class = "hljs-function" > < span class = "hljs-keyword" > def< / span > < span class = "hljs-title" > eval_node< / span > < span class = "hljs-params" > (node)< / span > :< / span >
node_type = type(node)
< span class = "hljs-keyword" > if< / span > node_type == Num:
< span class = "hljs-keyword" > return< / span > node.n
< span class = "hljs-keyword" > if< / span > node_type < span class = "hljs-keyword" > not< / span > < span class = "hljs-keyword" > in< / span > [BinOp, UnaryOp]:
< span class = "hljs-keyword" > raise< / span > TypeError(node)
operator_type = type(node.op)
< span class = "hljs-keyword" > if< / span > operator_type < span class = "hljs-keyword" > not< / span > < span class = "hljs-keyword" > in< / span > LEGAL_OPERATORS:
< span class = "hljs-keyword" > raise< / span > TypeError(< span class = "hljs-string" > f'Illegal operator < span class = "hljs-subst" > {node.op}< / span > '< / span > )
operator = LEGAL_OPERATORS[operator_type]
< span class = "hljs-keyword" > if< / span > node_type == BinOp:
left, right = eval_node(node.left), eval_node(node.right)
< span class = "hljs-keyword" > return< / span > operator(left, right)
< span class = "hljs-keyword" > elif< / span > node_type == UnaryOp:
operand = eval_node(node.operand)
< span class = "hljs-keyword" > return< / span > operator(operand)
< / code > < / pre >
< pre > < code class = "python language-python hljs" > < span class = "hljs-meta" > > > > < / span > evaluate(< span class = "hljs-string" > '2 ^ 6'< / span > )
< span class = "hljs-number" > 4< / span >
< span class = "hljs-meta" > > > > < / span > evaluate(< span class = "hljs-string" > '2 ** 6'< / span > )
< span class = "hljs-number" > 64< / span >
< span class = "hljs-meta" > > > > < / span > evaluate(< span class = "hljs-string" > '1 + 2 * 3 ** (4 ^ 5) / (6 + -7)'< / span > )
< span class = "hljs-number" > -5.0< / span >
< / code > < / pre >
< h2 id = "coroutine" > < a href = "#coroutine" name = "coroutine" > #< / a > Coroutine< / h2 >
< ul >
< li > < strong > Similar to generator, but generator pulls data through the pipe with iteration, while coroutine pushes data into the pipeline with send().< / strong > < / li >
@ -1626,7 +1584,7 @@ run(host=<span class="hljs-string">'0.0.0.0'</span>, port=<span class="hljs-numb
[< span class = "hljs-string" > 'arsenal f.c.'< / span > , < span class = "hljs-number" > 2.44< / span > , < span class = "hljs-number" > 3.29< / span > ]
< / code > < / pre >
< h2 id = "profile" > < a href = "#profile" name = "profile" > #< / a > Profile< / h2 >
< h3 id = "basic-1 " > Basic< / h3 >
< h3 id = "basic" > Basic< / h3 >
< pre > < code class = "python language-python hljs" > < span class = "hljs-keyword" > from< / span > time < span class = "hljs-keyword" > import< / span > time
start_time = time() < span class = "hljs-comment" > # Seconds since Epoch.< / span >
...
Jure Šorn
5 years ago