小编Mis*_*cic的帖子

这是我的代码

def fahrenheit(T):
    return ((float(9)/5)*T + 32)

temp = [0, 22.5, 40,100]
F_temps = map(fahrenheit, temp)

这是mapobject所以我试过这样的东西

for i in F_temps:
    print(F_temps)

<map object at 0x7f9aa050ff28>
<map object at 0x7f9aa050ff28>
<map object at 0x7f9aa050ff28>
<map object at 0x7f9aa050ff28>

我不确定,但我认为我的解决方案可以用Python 2.7,如何用3.5改变它？

我在 Ubuntu 16.04 上，我已经用 pip 安装了 Airflow。下一步

airflow initdb
[2017-07-29 12:20:23,483] {__init__.py:57} INFO - Using executor SequentialExecutor
DB: sqlite:////home/milenko/airflow/airflow.db
[2017-07-29 12:20:23,813] {db.py:287} INFO - Creating tables
INFO  [alembic.runtime.migration] Context impl SQLiteImpl.

这很好用。但是当我尝试启动网络服务器时

airflow webserver -p 8080
[2017-07-29 12:20:45,913] [4585] {models.py:167} INFO - Filling up the DagBag from /home/milenko/airflow/dags
Running the Gunicorn Server with:
Workers: 4 sync
Host: 0.0.0.0:8080
Timeout: 120
Logfiles: - -
=================================================================            
[2017-07-29 12:20:46,950] {__init__.py:57} INFO - Using executor SequentialExecutor
[2017-07-29 12:20:47 +0200] [4590] [INFO] Starting gunicorn 19.3.0 …

我导入的Python模块

import Queue
from threading import Thread
import time

但是当我运行代码时

File "b1.py", line 3, in <module>
    import Queue
ModuleNotFoundError: No module named 'Queue'

我在SO上看过类似的帖子,但对我来说没有用

/usr/bin/python3 --version
Python 3.5.2
milenko@milenko-System-Product-Name:~$ python --version
Python 3.6.0 :: Anaconda custom (64-bit)

如果我换到

from multiprocessing import Queue

没有进口问题.但比我有这个

AttributeError: 'Queue' object has no attribute 'join'

我接下来应该尝试什么？

我正在尝试使用端口扫描程序.

import socket
import subprocess
import sys
from datetime import datetime

subprocess.call('clear', shell=True)

remoteServer    = input("Enter a remote host to scan: ")
remoteServerIP  = socket.gethostbyname(remoteServer)

print( "-" * 60)
print( "Please wait, scanning remote host", remoteServerIP)
print( "-" * 60)

t1 = datetime.now()

try:
    for port in range(1,1025):  
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        result = sock.connect_ex((remoteServerIP, port))
        if result == 0:
            print( "Port {}:     Open".format(port))
        sock.close()

except KeyboardInterrupt:
    print( "You pressed Ctrl+C")
    sys.exit()

except socket.gaierror:
    print( 'Hostname could not be resolved. …

对于tensorflow,我是新手,我正在学习

https://www.tensorflow.org/get_started/get_started

fixW = tf.assign(W, [-1.])

工作正常,但是

fixb = tf.assign(b, [1.])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/milenko/anaconda3/lib/python3.6/site-packages/tensorflow/python/ops/state_ops.py", line 272, in assign
    return ref.assign(value)
AttributeError: 'Tensor' object has no attribute 'assign'

另一个例子

zero_tsr = tf.zeros([1.,2.])
zero_tsr
<tf.Tensor 'zeros:0' shape=(1, 2) dtype=float32>

如果我尝试更改zero_tsr

fixz = tf.assign(zero_tsr, [2.,2.])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/milenko/anaconda3/lib/python3.6/site-packages/tensorflow/python/ops/state_ops.py", line 272, in assign
    return ref.assign(value)
AttributeError: 'Tensor' object has no attribute 'assign'

同样,同样的问题.

我没有改变shell,一切都是一样的.为什么我这里有问题？

我玩了一点

import tensorflow as tf
x = tf.Variable([1.0, 2.0])
initializer = tf.global_variables_initializer()
session.run(initializer)
x
<tf.Variable 'Variable:0' shape=(2,) dtype=float32_ref>
y = 2 * x
y
<tf.Tensor 'mul:0' shape=(2,) dtype=float32>
z = y + 1
z
<tf.Tensor 'add:0' shape=(2,) dtype=float32>
v = session.run(x)
sess.run(initializer)
v = sess.run(x) 
print (v)
[ 1.  2.]
v1 = sess.run(z)
print (v1)
[ 3.  5.]
v = sess.run(x)

我有3个变量x,y,z.是否可以显示使用提示中的一个命令定义的所有变量？如果我尝试Jonas的建议

new = tf.trainable_variables()
print (new)
[<tf.Variable 'Variable:0' shape=(2,) dtype=float32_ref>]

items = ['a', 'b', 'c','d']
from itertools import permutations
for p in permutations(items):
    p1=(''.join(p))
    p2=filter(lambda x: x[1]=='b',p1)

我想在第二个索引上用b排除字符串.当我尝试打印过滤器对象时

<filter at 0x7f8d729ba908>
for p in p2:
    print (p)

IndexError                                Traceback (most recent call last)
<ipython-input-27-fbcaa516953f> in <module>()
----> 1 for p in p2:
      2     print (p)

<ipython-input-23-c6289753f791> in <lambda>(x)
      1 for p in permutations(items):
      2     p1=(''.join(p))
----> 3     p2=filter(lambda x: x[1]=='b',p1)

IndexError: string index out of range

lambda是正确的选择吗？为什么我有字符串索引问题？

我想检查是否以正确的方式将csv文件导入MySQL数据库。

import MySQLdb

mydb = MySQLdb.connect(host = 'localhost',user = 'milenko',passwd = 'nuklear',db = 'mm')
cur = mydb.cursor()
command = cur.execute('SELECT * FROM jul')
results = command.fetchall()

print (results)

但是我明白了

File "b12.py", line 6, in <module>
    results = command.fetchall()
AttributeError: 'int' object has no attribute 'fetchall'

我看过以前的SO帖子，人们声称数字对象没有fetcall对象。如何一次性删除数据库内容？

我有字典

from collections import OrderedDict 

md = {"r3":"piz","r1":"pic","r9":"piz","r12":"pic","r19":"lia","r2":"kurcc","r21":"jes","r99":"pic","r111":"kurcc","r116":"kurcc","r211":"ar","r221":"buc"}

print (OrderedDict(sorted(md.items(), key=lambda t: t[0])))

我想从最低的数字中对它进行排序.但是我得到了

OrderedDict([('r1', 'pic'), ('r111', 'kurcc'), ('r116', 'kurcc'), ('r12', 'pic'), ('r19', 'lia'), ('r2', 'kurcc'), ('r21', 'jes'), ('r211', 'ar'), ('r221', 'buc'), ('r3', 'piz'), ('r9', 'piz'), ('r99', 'pic')])

我应该如何更改代码以使r1,r2,r3顺序？

我的Python3代码

def ask():

    while True:
        try:
            n = input('Input an integer: ')
        except:
            print ('An error occurred! Please try again!')
            continue
        else:
            break


    print ('Thank you, you number squared is: ', n**2)

如果我想取一个数字的正方形,为什么会出错？

unsupported operand type(s) for ** or pow(): 'str' and 'int' 

从命令行没问题

>>> 3**2
9