python-2.7

问题 I get the following error during Python 2.7 64-bit windows installation. I previously installed python 3.5 64-bit and it worked fine. But during python 2.7 installation i get this error: Traceback (most recent call last): File "C:\Anaconda2\Lib\_nsis.py", line 164, in <module> main() File "C:\Anaconda2\Lib\_nsis.py", line 150, in main mk_menus(remove=False) File "C:\Anaconda2\Lib\_nsis.py", line 94, in mk_menus err("Traceback:\n%s\n" % traceback.format_exc(20)) IOError: [Errno 9] Bad file

问题 I get the following error during Python 2.7 64-bit windows installation. I previously installed python 3.5 64-bit and it worked fine. But during python 2.7 installation i get this error: Traceback (most recent call last): File "C:\Anaconda2\Lib\_nsis.py", line 164, in <module> main() File "C:\Anaconda2\Lib\_nsis.py", line 150, in main mk_menus(remove=False) File "C:\Anaconda2\Lib\_nsis.py", line 94, in mk_menus err("Traceback:\n%s\n" % traceback.format_exc(20)) IOError: [Errno 9] Bad file

问题 I have this signal : from math import* Fs=8000 f=500 sample=16 a=[0]*sample for n in range(sample): a[n]=sin(2*pi*f*n/Fs) How can I plot a graph (this sine wave)? and create name of xlabel as 'voltage(V)' and ylabel as 'sample(n)' What code to do this? I am so thanksful for help ^ _ ^ 回答1: Setting the x-axis with np.arange(0, 1, 0.001) gives an array from 0 to 1 in 0.001 increments. x = np.arange(0, 1, 0.001) returns an array of 1000 points from 0 to 1, and y = np.sin(2*np.pi*x) you will get

问题 I installed google-chrome in a Docker, but when I run my Python 2 script of Selenium, it failed like this: automation@1c17781fef0c:/topology-editor/test$ python test.py Traceback (most recent call last): File "test.py", line 27, in <module> browser = webdriver.Chrome() File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/chrome/webdriver.py", line 69, in __init__ desired_capabilities=desired_capabilities) File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote

问题 I installed google-chrome in a Docker, but when I run my Python 2 script of Selenium, it failed like this: automation@1c17781fef0c:/topology-editor/test$ python test.py Traceback (most recent call last): File "test.py", line 27, in <module> browser = webdriver.Chrome() File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/chrome/webdriver.py", line 69, in __init__ desired_capabilities=desired_capabilities) File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote

问题 I am reading data in from a text file so each row is a list of strings, and all those lists are in a data list. So my lists look like: data = [row1, row2, etc.] row1 = [str1, str2, etc.] I am trying to remove any $ or % signs that appear in the strings in a row list. I have checked that if I try and do this for one individual element, say the second row and the fourth element has a "%", so: data[1][3] = data[1][3].replace("%","") This will properly remove it, but when I try and use a nested

问题 I am reading data in from a text file so each row is a list of strings, and all those lists are in a data list. So my lists look like: data = [row1, row2, etc.] row1 = [str1, str2, etc.] I am trying to remove any $ or % signs that appear in the strings in a row list. I have checked that if I try and do this for one individual element, say the second row and the fourth element has a "%", so: data[1][3] = data[1][3].replace("%","") This will properly remove it, but when I try and use a nested

问题 I am reading data in from a text file so each row is a list of strings, and all those lists are in a data list. So my lists look like: data = [row1, row2, etc.] row1 = [str1, str2, etc.] I am trying to remove any $ or % signs that appear in the strings in a row list. I have checked that if I try and do this for one individual element, say the second row and the fourth element has a "%", so: data[1][3] = data[1][3].replace("%","") This will properly remove it, but when I try and use a nested

问题 I am reading data in from a text file so each row is a list of strings, and all those lists are in a data list. So my lists look like: data = [row1, row2, etc.] row1 = [str1, str2, etc.] I am trying to remove any $ or % signs that appear in the strings in a row list. I have checked that if I try and do this for one individual element, say the second row and the fourth element has a "%", so: data[1][3] = data[1][3].replace("%","") This will properly remove it, but when I try and use a nested

问题 This... class A(object): class B(A): def __init__(self): pass ... throws "NameError: name 'A' is not defined". Is there proper syntax to accomplish this, or must I use workarounds, like this? class A(object): pass class _B(A): pass A.B = _B The prior is strongly preferable. Thank you. 回答1: As per OPs request, posting as an answer. That's an inner class, not a subclass. No, an inner class can't inherit (not extend) its outer class because the outer class is not fully defined while defining the