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鍍金池/ 問答/ Python問答
熊出沒 回答

這個(gè)要看你使用的是哪一個(gè)準(zhǔn)確率,目前了解的TF有兩種準(zhǔn)確率:

  1. stream-acc:這個(gè)是統(tǒng)計(jì)過往所有的已經(jīng)訓(xùn)練結(jié)果的準(zhǔn)確率
  2. batch-acc:這個(gè)才是你理解的準(zhǔn)確率
離魂曲 回答
sentence0 = [['a','b'],[3,4],[1,2,3],[12,3]]
sentence1 = [[5,'b'],[7,8]]

def print_count(l):
    count = 0
    for i in l:
        if isinstance(i, list):
            count += 1
            print_count(i)
    return count


print(print_count(sentence0))     //打印4
print(print_count(sentence1))     //打印2
尋仙 回答

不是python程序員,不過分享一些對(duì)于樹形結(jié)構(gòu)的研究。
如果你用的數(shù)據(jù)庫支持層次化查詢最好。比如Oracle的Connect By或者其他數(shù)據(jù)庫的CTE.由數(shù)據(jù)庫幫你計(jì)算Level, Path, IS_LEAF最好,否者利用程序去實(shí)現(xiàn)Lazy Load會(huì)比較麻煩。對(duì)于CTE的支持現(xiàn)在越來越普及了,可以考慮。

數(shù)據(jù)庫中實(shí)現(xiàn)樹形結(jié)構(gòu)有兩種方式:adjacent list和nested set。一般都是前者

筱饞貓 回答

正常的status200不需要,但是特殊的400錯(cuò)誤當(dāng)然需要自己raise出來

墻頭草 回答

你修改一下數(shù)字~是不是設(shè)置的太大了

葬愛 回答

我新手上路,用正則表達(dá)式去根據(jù)你給出的例子的數(shù)據(jù)去匹配的,我是根據(jù)two給出的值去匹配one,所以前提是two.csv文件不能太大,我剛剛測(cè)試了一千萬條(大概500M左右,每一百條有一條匹配)的數(shù)據(jù)用了4分鐘,效率不是很高,程序是默認(rèn)編碼,如果要轉(zhuǎn)碼效率可能會(huì)再差點(diǎn),數(shù)據(jù)真是超大的話我覺得還是用c語言去寫工作效率會(huì)高點(diǎn)

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import re
import os
#用來匹配two.csv列2和列3的值
reg_list2 = re.compile(r'.+?,.+?,\s*(.+?)\s*[;]*\s*,\s*(\d+)\s*')
#用來匹配one.csv列2的值
reg_name = re.compile(r'.+?,.+?,\s*(.+?)\s*[;]*,')
#匹配頭
reg_title = re.compile(r'\s*\S+.+')
def main(argv):
    try:
        fptwo = open("two.csv", "r")
        fpone = open("one.csv", "r")
        fpnew = open("result.csv", "a")
    except UnicodeDecodeError:
        exit(1)
    text = fptwo.read()
    fptwo.close()
    
    data_two = [(re.escape(x),n) for x,n in reg_list2.findall(text)]
    otime = datetime.datetime.now()
    title = None
    new = "列4\n" #新列名字
    tell = fpone.tell()
    nu = 0    
    
    while True:
        line = fpone.readline()
        mate = reg_name.match(line)

        if not title:
            mate = reg_title.search(line)
            if mate:
                title = mate.group(0)
                title = (title + ",").ljust(len(title)+15) + new
                fpnew.write(title)
                continue
        
        if mate:
            name = mate.group(1)
            for item in data_two:
                if re.search(item[0],name):
                    line = line[:-1]
                    line = (line + ",").ljust(len(title))  + item[1] + "\n"
                    print ("Pos L:", nu, "name: ", name)
        
        fpnew.write(line)
        nu += 1
        if tell == fpone.tell():
            break
        else:
            tell = fpone.tell()
    fpone.close()
    fpnew.close()
    return 0

if __name__ == '__main__':
    import sys
    sys.exit(main(sys.argv))
病癮 回答

swoole連RFC6455都沒完全實(shí)現(xiàn),壓縮擴(kuò)展也沒有……雖然不影響基本的使用,但是超出了swoole支持的范圍就不方便了。

而python的websockets,完整實(shí)現(xiàn)RFC6455,有uvloop(Cython + libuv)IO也性能不會(huì)差。

懷中人 回答

先說答案:.prop( "checked", false )

有興趣可以看看為什么?

https://jquery.com/upgrade-gu...

Prior to jQuery 3.0, using .removeAttr() on a boolean attribute such as checked, selected, or readonly would also set the corresponding named property to false. This behavior was required for ancient versions of Internet Explorer but is not correct for modern browsers because the attribute represents the initial value and the property represents the current (dynamic) value.

It is almost always a mistake to use .removeAttr( "checked" ) on a DOM element. The only time it might be useful is if the DOM is later going to be serialized back to an HTML string. In all other cases, .prop( "checked", false ) should be used instead.

萌二代 回答
If i or j is negative, the index is relative to the end of sequence s: len(s) + i or len(s) + j is substituted. But note that -0 is still 0.
The slice of s from i to j is defined as the sequence of items with index k such that i <= k < j. If i or j is greater than len(s), use len(s). If i is omitted or None, use 0. If j is omitted or None, use len(s). If i is greater than or equal to j, the slice is empty.

以上是文檔對(duì)切片的說明,可以看出使用切片時(shí)會(huì)先對(duì)冒號(hào)前后的i與j進(jìn)行判斷,所以''[-1:]中,判斷后的i與j的值相等,故返回的切片為空,不會(huì)報(bào)錯(cuò)。
另外去除字符串首尾空格可以考慮直接用str自帶的函數(shù)strip()

青檸 回答

python語法中沒有 ++ -- 這種用法
改成 i = i-1 試試

還有就是函數(shù)變量名沒有傳進(jìn)來,opentime需要在函數(shù)括號(hào)里面
def openLLQtime(opentime):

不是傳遞i 是傳遞opentime

你的py文件里有調(diào)用函數(shù)么 類似 openLLQtime(opentime)

命多硬 回答

你連xpath都能寫錯(cuò),我還能說什么?

伐木累 回答

一個(gè)form只需一個(gè)hidden input 存放scrf隨機(jī)數(shù),每次載入form 或提交失敗後都會(huì)讀取新的scrf隨機(jī)數(shù)放入這個(gè)input,而這個(gè)scrf隨機(jī)數(shù)應(yīng)交由你的框架生成(當(dāng)然你自己創(chuàng)造一個(gè)生成器也行)。方便的做法是每次載入form或提交失敗時(shí)用ajax取得這個(gè)scrf然後放入input,確保每次提交時(shí)都是正確的scrf隨機(jī)數(shù)。

*這個(gè)scrf應(yīng)該有時(shí)效性,比如設(shè)置成7000,就代表從提交form一刻數(shù)7秒,如超過7秒仍未提交成功則scrf隨機(jī)數(shù)會(huì)過期,form提交失敗。

久不遇 回答

apply_async(func[, args[, kwds[, callback]]])
你的用法明顯不對(duì)嗎。

import time
from multiprocessing import Pool

def func(n):
    print "This starts task{}.".format(n)
    time.sleep(n)
    print "This ends task{}.".format(n)

    
pool = Pool(processes=3)
pool.map(func, range(3))
pool.join()
瘋浪 回答

你用的是python3, 那個(gè)前綴u不用加,不然反而誤導(dǎo):

python2: str   -> decode -> Unicode      -> encode -> str
python3:  bytes -> decode -> str(Unicode) -> encode -> bytes

你加些中文就能看出區(qū)別了:

import base64
x = "你好啊xx"
print(x)
print(x.encode('utf-8')) # b'\xe4\xbd\xa0\xe5\xa5\xbd\xe5\x95\x8axx'

比如這里utf-8以3個(gè)字節(jié)表示一個(gè)漢字,最后兩個(gè)xx因?yàn)槭窃赼scii集合里,所以會(huì)打印為可讀字符

莓森 回答

你好,麻煩問一下你有curaEngine編譯的資料嗎,有的話能給我發(fā)一份嗎
另外我會(huì)ultimaker系列的curaEngine的命令行控制,你要是還沒解決這個(gè)問題的話我應(yīng)該能給些幫助

愛是癌 回答
for i in r:
    print(i)
巫婆 回答

就是內(nèi)存不足,加大內(nèi)存。還有一個(gè)方法,先把上傳的圖片縮小再去識(shí)別