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”
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=...
不使用语句或正常读取方法,也可以正确读取一行文件。 #一行读取文件 #正常方式 with open("data.txt", "r") as file: data = file.readline() print(data) # Hello world #单行方式 data = [line.strip() for line in open("data.txt","r")] print(data) # ['hello world', 'Hello Python'] 1...
<code object <module> at 0x7fc8d3dcaf30, file "", line 1> >>> exec single_code Hello world! 可执行语句组: >>> exec_code = compile(""" ... req =input('Count how many numbers?') ... for eachNum in range(req): ... print eachNum ... """, '' ,'exec') >>> exec ex...
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...
A for loop is a programming construct that allows a block of code to be executed repeatedly until a certain condition is met.
Two basic loop types are for loops and while loops. For loops iterate through a list and while loops run until a condition is met or until we break out of the loop. We used a for loop in earlier scripts (e.g., pass.py), but we haven't seen a while loop yet:...
(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...
Free privacy protection for eligible domains Save now What is the for loop in Python? The for loop is one of the most well-known programming constructs. Let’s look at it using a concrete example from everyday life. Say that a teacher wants to calculate the average height of her stude...
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。