Question

我无法使函数调用正常工作。这是一个示例调用：

def polyline(t,n,length,angle):
    """Draws n line segments with the given length and 
    angle(in degrees) between them. t is a turtle.
    """
    for i in range(n):
        t.fd(length)
        t.lt(angle)

关联的呼叫类似

alex=turtle.Turtle()

polyline(alex,5,100,90)

我已经导入了龟，但是出现以下错误：

TclError: invalid command name ".!canvas"

我想念什么？

Answer 1

似乎我必须在进行函数调用之前连续定义alex。例如，这可行：

 def polyline(t,n,length,angle):
    """Draws n line segments with the given length and 
    angle(in degrees) between them. t is a turtle.
    """
    for i in range(n):
        t.fd(length)
        t.lt(angle)


alex=turtle.Turtle() 
#Test polyline
polyline(alex,5,780,90)

此操作失败：

alex=turtle.Turtle() 
#insert some other functions


 #define polyline function

#call polyline

找不到Turtle命令名称

1 个答案: