<pre id="vvttv"><mark id="vvttv"><progress id="vvttv"></progress></mark></pre>
    <pre id="vvttv"></pre>

      <p id="vvttv"></p>

          <p id="vvttv"></p>

                <p id="vvttv"></p>

                <pre id="vvttv"><cite id="vvttv"><progress id="vvttv"></progress></cite></pre>

                  <output id="vvttv"><dfn id="vvttv"><th id="vvttv"></th></dfn></output>

                    <p id="vvttv"></p>

                    ???? Python ???
                    ??5?? ??????????
                    ???? ????? ????

                    ?????

                    ??????????????????????????÷???

                    ????

                    ????????????y????????????????и?????????????磬?????????2 + 3????y??????????????Python????????

                    >>> 2 + 3
                    5
                    >>> 3 * 5
                    15
                    >>>

                    ??5.1 ?????????????÷?

                    ????? ???? ??? ????
                    + ?? ??????????? 3 + 5???8??'a' + 'b'???'ab'??
                    - ?? ?????????????????????????? -5.2????????????50 - 24???26??
                    * ?? ??????????????????????????ε?????? 2 * 3???6??'la' * 3???'lalala'??
                    ** ??

                    ????x??y????

                    3 ** 4???81????3 * 3 * 3 * 3??
                    / ?? x????y 4/3???1?????????????????????????4.0/3??4/3.0???1.3333333333333333
                    // ????? ??????????????? 4 // 3.0???1.0
                    % ?? ????????????? 8%3???2??-25.5%2.25???1.5
                    << ???? ?????????????????????????????????????ж??????????????????????0??1?? 2 << 2???8??????2?????????10
                    >> ???? ???????????????????????? 11 >> 1???5??????11?????????1011?????????1???????101??????????5??
                    & ??λ?? ?????λ?? 5 & 3???1??
                    | ??λ?? ?????λ?? 5 | 3???7??
                    ^ ??λ??? ?????λ??? 5 ^ 3???6
                    ~ ??λ??? x???λ?????-(x+1) ~5???-6??
                    < С?? ????x???С??y?????б???????????1????棬????0????????????????????True??False?????????Щ?????????д?? 5 < 3????0????False????3 < 5????1????True????????????????????3 < 5 < 7????True??
                    > ???? ????x??????y 5 > 3????True???????????????????????????????????????????????????????????????False??
                    <= С????? ????x???С?????y x = 3; y = 6; x <= y????True??
                    >= ??????? ????x?????????y x = 4; y = 3; x >= y????True??
                    == ???? ???????????? x = 2; y = 2; x == y????True??x = 'str'; y = 'stR'; x == y????False??x = 'str'; y = 'str'; x == y????True??
                    != ?????? ????????????????? x = 2; y = 3; x != y????True??
                    not ????????? ???x?True??????False?????x?False????????True?? x = True; not x????False??
                    and ???????? ???x?False??x and y????False????????????y???????? x = False; y = True; x and y??????x??False??????False????????Python???????y?????????????????????????False?????x??False???????????????·????
                    or ???????? ???x??True????????True????????????y???????? x = True; y = False; x or y????True????·??????????????á?

                    ???? ????? ????
                    ??? ??? ??????????
                    ?????
                    ???

                    ????????????? ????,??л???????????????
                    ????~ ??λ???,??л?????Bitex

                      <pre id="vvttv"><mark id="vvttv"><progress id="vvttv"></progress></mark></pre>
                      <pre id="vvttv"></pre>

                        <p id="vvttv"></p>

                            <p id="vvttv"></p>

                                  <p id="vvttv"></p>

                                  <pre id="vvttv"><cite id="vvttv"><progress id="vvttv"></progress></cite></pre>

                                    <output id="vvttv"><dfn id="vvttv"><th id="vvttv"></th></dfn></output>

                                      <p id="vvttv"></p>

                                      这里只有精品视频