带范围函数的python 3

我可以在终端中输入以下代码,它可以工作:

for i in range(5):
    print(i)

它将打印:

0
1
2
3
4

如预期。但是,我试图写一个类似的脚本:

print(current_chunk.data)
read_chunk(file, current_chunk)
numVerts, numFaces, numEdges = current_chunk.data
print(current_chunk.data)
print(numVerts)

for vertex in range(numVerts):
    print("Hello World")

当前chunk.data通过以下方法获得:

def read_chunk(file, chunk):
    line = file.readline()
    while line.startswith('#'):
        line = file.readline()
    chunk.data = line.split()

其输出为:

['OFF']
['490', '518', '0']
490
Traceback (most recent call last):
  File "/home/leif/src/install/linux2/.blender/scripts/io/import_scene_off.py", line 88, in execute
    load_off(self.properties.path, context)
  File "/home/leif/src/install/linux2/.blender/scripts/io/import_scene_off.py", line 68, in load_off
    for vertex in range(numVerts):
TypeError: 'str' object cannot be interpreted as an integer

那么,它为什么不吐出“你好世界”490次呢?或者490被认为是一根绳子?

我像这样打开文件:

def load_off(filename, context):
    file = open(filename, 'r')