or any object. For loop avoids multiple usages of code lines to make the program concise and simple. The “One line for loop” is also the form of “for loop” which means that a complete syntax of “for loop” is written in a single line. The “one line for loop” considers only ...
下面是单行for循环的流程图: StartInput_dataSingle_line_for_loopOutput_resultEnd 饼状图 最后,我们来看一个使用单行for循环生成饼状图的例子。假设我们有一个包含各类水果数量的字典,我们可以使用单行for循环来生成饼状图: importmatplotlib.pyplotasplt fruit_dict={'apple':3,'banana':2,'orange':5}labels=...
deffetch_url(url):response=requests.get(url)print(f'获取 {url} 的响应: {response.status_code}')urls=['https://www.example.com','https://www.python.org','https://www.github.com']threads=[]forurlinurls:thread=threading.Thread(target=fetch_url,args=(url,))threads.append(thread)thread....
print(result) # [300, 400, 500]#One Line Way result = [x for x in mylist if x > 250] print(result) # [300, 400, 500] 2、 一行 While 循环 这个单行片段将向你展示如何在单行中使用 While 循环代码,我已经展示了两种方法。 #方法 1 Single Statement while True: print(1) #infinite 1 ...
This program was designedforPython3,not Python2.""" defspam():"""This is a multiline comment to help explain what thespam()functiondoes."""print('Hello!') 索引和切片字符串 字符串和列表一样使用索引和切片。您可以将字符串'Hello, world!'视为一个列表,并将字符串中的每个字符视为一个具有相...
Loop through the letters in the word "banana": forxin"banana": print(x) Try it Yourself » Learn more about For Loops in ourPython For Loopschapter. String Length To get the length of a string, use thelen()function. Example Thelen()function returns the length of a string: ...
(GL_LINE_LOOP) for i in range(100): glVertex2f(R * math.cos(2 * PI / 100 * i), R * math.sin(2 * PI / 100 * i)) glEnd() glLineWidth(2) for i in range(100): glBegin(GL_LINES) glVertex2f(TR * math.sin(2 * PI / 12 * i), TR * math.cos(2 * PI / 12 * i...
File"iteration.py", line19,in__next__raiseStopIteration StopIteration 我们实例化了MyIterator,然后为了获取它的值,我们多次调用了next()。当序列到头时,next()会抛出异常StopIteration。Python 中的for循环使用了同样的机制,它调用迭代器的next(),通过获取异常StopIteration得知何时停止。
但通常安装成功之后,运行代码会报错“OpenGL.error.NullFunctionError: Attempt to call an undefined function glutInit, check for bool(glutInit) before calling”。 据说是pip默认安装的是32位版本的pyopengl,而作者的操作系统是64位。网上很多大牛会去 “https://www.lfd.uci.edu/~gohlke/pythonlibs/#pyopengl”...
for循环 #!/usr/bin/python # Filename: for.py foriinrange(1,5): print(i) else: print('The for loop is over') 我们所做的只是提供两个数,range返回一个序列的数。这个序列从第一个数开始到第二个数 为止。例如,range(1,5)给出序列[1, 2, 3, 4]。默认地,range的步长为1。如果我们为rang...