python-2.7

问题 So I have Selenium code that goes to a page using chrome. Now at that page, there is this HTML; <span ngbind="pageData.Message">Heloooo</span> How can I get the value using python and Selenium? So only the Heloooo . Thanks! 回答1: You can use the following CSS Selector for locating the element: span[ngbind='pageData.Message'] Code: element = driver.find_element_by_css_selector("span[ngbind='pageData.Message']") print(element.text) # Will print the "Heloooo" value. Hope it helps you! 回答2: You

问题 This Question / Answer (Python call constructor in a member function) says it is possible to to call the constructor from within a member function. How do I do that? Is it good a style? I tried it with the following code: class SomeClass(object): def __init__(self, field): self.field = field def build_new(self): self = SomeClass(True) def main(): inst = SomeClass(False) inst.build_new() print(inst.field) if __name__ == '__main__': main() As output I get: False Since I called the build_new()

问题 This Question / Answer (Python call constructor in a member function) says it is possible to to call the constructor from within a member function. How do I do that? Is it good a style? I tried it with the following code: class SomeClass(object): def __init__(self, field): self.field = field def build_new(self): self = SomeClass(True) def main(): inst = SomeClass(False) inst.build_new() print(inst.field) if __name__ == '__main__': main() As output I get: False Since I called the build_new()

问题 In attempt to learn python by practicing, I am trying to implement and test out quick sort algorithm using python. The implementation itself was not difficult, however the result of the sort is somewhat puzzling: When I sort a list ['35', '-1', '-2', '-7', '-8', '-3', '-4', '20', '-6', '53'] the result gives me ['-1', '-2', '-3', '-4', '-6', '-7', '-8', '20', '35', '53'] So the list is sorted however the negative integers are sorted in reverse order. I suspect this may be the problem with the

问题 In attempt to learn python by practicing, I am trying to implement and test out quick sort algorithm using python. The implementation itself was not difficult, however the result of the sort is somewhat puzzling: When I sort a list ['35', '-1', '-2', '-7', '-8', '-3', '-4', '20', '-6', '53'] the result gives me ['-1', '-2', '-3', '-4', '-6', '-7', '-8', '20', '35', '53'] So the list is sorted however the negative integers are sorted in reverse order. I suspect this may be the problem with the

问题 I'm new to python programming. I want to extract a video/audio size ( any youtube video) before downloading it ?? 回答1: >>> from youtube_dl import YoutubeDL >>> url = 'https://www.youtube.com/watch?v=PSYxT9GM0fQ' >>> ytdl = YoutubeDL() >>> info = ytdl.extract_info(url, download=False) [youtube] PSYxT9GM0fQ: Downloading webpage [youtube] PSYxT9GM0fQ: Downloading video info webpage [youtube] PSYxT9GM0fQ: Extracting video information [youtube] PSYxT9GM0fQ: Downloading DASH manifest >>> formats =

问题 I'm new to python programming. I want to extract a video/audio size ( any youtube video) before downloading it ?? 回答1: >>> from youtube_dl import YoutubeDL >>> url = 'https://www.youtube.com/watch?v=PSYxT9GM0fQ' >>> ytdl = YoutubeDL() >>> info = ytdl.extract_info(url, download=False) [youtube] PSYxT9GM0fQ: Downloading webpage [youtube] PSYxT9GM0fQ: Downloading video info webpage [youtube] PSYxT9GM0fQ: Extracting video information [youtube] PSYxT9GM0fQ: Downloading DASH manifest >>> formats =

问题 I am trying out the pyo for python. I installed the pyo for ubuntu using these commands from the homepage: sudo apt-get install libjack-jackd2-dev libportmidi-dev portaudio19-dev liblo-dev sudo apt-get install libsndfile-dev python-dev python-tk sudo apt-get install python-imaging-tk python-wxgtk3.0 git clone https://github.com/belangeo/pyo.git cd pyo sudo python setup.py install --install-layout=deb --use-jack --use-double Howerver when i try the very first example to Play a sound: >>> from

问题 I'm trying to open a stereo stream and convert it to mono, using the wave module in python. So far I was able to write a single (left or right) channel from a 16bit stereo little endian file: LEFT, RIGHT = 0, 1 def mono_single(cont, chan=LEFT): a = iter(cont) mono_cont = '' if chan: a.next(); a.next() while True: try: mono_cont += a.next() + a.next() a.next(); a.next() except StopIteration: return mono_cont stereo = wave.open('stereofile.wav', 'rb') mono = wave.open('monofile.wav', 'wb') mono

问题 I'm trying to open a stereo stream and convert it to mono, using the wave module in python. So far I was able to write a single (left or right) channel from a 16bit stereo little endian file: LEFT, RIGHT = 0, 1 def mono_single(cont, chan=LEFT): a = iter(cont) mono_cont = '' if chan: a.next(); a.next() while True: try: mono_cont += a.next() + a.next() a.next(); a.next() except StopIteration: return mono_cont stereo = wave.open('stereofile.wav', 'rb') mono = wave.open('monofile.wav', 'wb') mono