#!/bin/bash
for i in {0..20..2}
do
#f=$(printf %3.1f `echo "scale=1; $i/10" | bc`) # old version
printf -v f %3.1f `echo "scale=1; $i/10" | bc` # new version
echo $f
done
$ lspci | grep Ethernet
04:00.0 Ethernet controller: Atheros Communications AR8152 v1.1 Fast Ethernet (rev c1)
$ make
$ sudo make install
$ cd src/
$ sudo cp atl1e.ko /lib/modules/2.6.32-21-generic/kernel/drivers/net/atlx/
$ sudo depmod -a
>>> A = [1,2,3]
>>> B = A
>>> B[0]=-1
>>> A
[-1, 2, 3]
>>> B is A
True
>>> B.index, A.index
(, )
>>> B = A[:]---
>>> B is A
False
>>> B.index, A.index
(, )
>>> A = [[]]*3
>>> A
[[], [], []]
>>> for i in range(3):
... for j in range(3):
... A[i].append(i+j)
...
>>> A
[[0, 1, 2, 1, 2, 3, 2, 3, 4], [0, 1, 2, 1, 2, 3, 2, 3, 4], [0, 1, 2, 1, 2, 3, 2, 3, 4]]
A = [[0, 1, 2], [1, 2, 3], [2, 3, 4]]
>>> A = [[] for rows in range(3)]
>>> A
[[], [], []]
>>> for i in range(3):
... for j in range(3):
... A[i].append(i+j)
...
>>> A
[[0, 1, 2], [1, 2, 3], [2, 3, 4]]
ls * | sed -e p -e 's/.*/\L&/g' |xargs -n 2 mv
Download, build, install, upgrade, and uninstall Python packages -- easily!Then followed the steps which also given in Installing multiple versions of Python on Ubuntu from Source. Finally, set link to easy_install, for example:
$ sudo ln -s /opt/python2.6/bin/easy_install-2.6 /usr/bin/easy_install2.6---
$ sudo easy_install2.6 numpyThe installation of matplotlib got an error message as below:
$ sudo easy_install2.6 matplotlib
error: Setup script exited with error: command 'gcc' failed with exit status 1I followed the method proposed here, and installed ``libpq-dev'' but it didn't work. Then I found the solution which is as follows:
$ sudo apt-get build-dep matplotlibSo far, one thing is still bothering me. I have no idea how to let IPython work with Python 2.6.
A common beginner’s mistake is to call the callback function when constructing the widget. That is, instead of giving just the function’s name (e.g. “callback”), the programmer adds parentheses and argument values to the functionThat's true. I just solved one problem of this kind in my code.
1. from Tkinter import *
2.
3. def cb_test(i):
4. print i
5.
6. root = Tk()
7.
8. for i in range(5):
9. Button(root, text=str(i), command=cb_test(i)).pack() # test 1
9. Button(root, text=str(i), command=lambda:cb_test(i)).pack() # test 2
9. Button(root, text=str(i), command=lambda x=i:cb_test(x)).pack() # test 3
10. Button(root, text="Quit", command=root.quit).pack()
11.
12. root.mainloop()
1. def foo(argv):
2. if not "your_static_var" in dir(foo):
3. foo.your_static_var = certain initial values
4. do something with foo.your_static_var
5. return foo.your_static_var
After toggling:
Note: When a PhotoImage object is garbage-collected by Python (e.g. when you return from a function which stored an image in a local variable), the image is cleared even if it’s being displayed by a Tkinter widget.
To avoid this, the program must keep an extra reference to the image object. A simple way to do this is to assign the image to a widget attribute, like this:
label = Label(image=photo)
label.image = photo # keep a reference!
label.pack()
from Tkinter import *
import time
class App:
def __init__(self, master):
frame = Frame(master).pack()
master.geometry("200x100")
var_text = StringVar()
counter = Label(frame)
counter.config(textvariable=var_text, font=("arial",60,"bold"), bg="green")
counter.pack(expand=YES, fill=BOTH)
for i in range(10):
time.sleep(1)
var_text.set(i)
master.update()
def main():
root = Tk()
app = App(root)
root.mainloop()
if __name__ == "__main__":
main()
from Tkinter import *
import time
class App:
def __init__(self, master):
frame = Frame(master).pack()
master.geometry("200x100")
counter = Label(frame)
counter.config(font=("arial",60,"bold"), bg="green")
counter.pack(expand=YES, fill=BOTH)
for i in range(10):
time.sleep(1)
counter.config(text=i)
master.update()
def main():
root = Tk()
app = App(root)
root.mainloop()
if __name__ == "__main__":
main()
"""
A ``countdown'' counter using Tkinter
Original version has given by vegaseat 17aug2007
http://www.daniweb.com/code/snippet216971.html
This version is modified from the original one
by thk 2010/06/05
"""
import Tkinter as tk
from itertools import count
def start_counter_down(label):
counter = count(0)
begin_time = 10 # sec.
def update_func():
left_time = begin_time - counter.next()
show_hr = left_time/3600
show_min = (left_time%3600)/60
show_sec = (left_time%3660)%60
label.config(text=\
str(show_hr).zfill(2)+':'+\
str(show_min).zfill(2)+':'+\
str(show_sec).zfill(2))
label.after(1000, update_func) # 1000ms
if left_time <= 0: label.config(text="Time's up!") update_func() root = tk.Tk() root.title("Counting Down") label = tk.Label(root, fg="red") label.pack() start_counter_down(label) button = tk.Button(root, text='Stop & Quit', width=30, command=root.destroy) button.pack() root.mainloop()
21c21
< x =" 250"> y = 250 - (i * 40)
28c28
<> scaled.append((100 + 3*x, 250 - (4*y)/5))
33c33
< width="1,"> canvas.create_oval(xs-6,ys-6,xs+6,ys+6, width=1,
