Question

def syntax_hilight_(event):
    for kw in keyword.kwlist:
        size = IntVar()
        begin = self.txt_field.search(kw, "1.0", stopindex = "end", count = size)
        #end_index = "%s + %sc" % (begin, size.get())
        print(size.get())
        size_int = float(size.get())
        while size_int > 1:
            size_int /= 10
        float(begin)
        end_index = float(begin) + size_int
        self.txt_field.tag_add("search", float(begin), float(end_index))
        self.txt_field.tag_config("search", foreground = "green")

当我运行此功能（按键）时，我收到此错误：

File "C:/Users/roman_000/PycharmProjects/neuron/ide_custom.py", line 36, 
    in syntax_hilight_
float(begin)
ValueError: could not convert string to float:

begin是一个包含6.0,6.9,14.19等索引的字符串。我认为将这些字符串转换为float没有问题

Answer 1

如果在文本中找不到kw，则会出现此问题，因此begin将为空，从而导致ValueError。当begin不为空时，请尝试突出显示。以下是我建议的解决方案：

def syntax_hilight_(self):
    size = tk.IntVar()
    for kw in keyword.kwlist:
        begin = self.txt_field.search(kw, '1.0', stopindex='end', count=size)
        if begin:
            end_index = '%s + %sc' % (begin, size.get())
            self.txt_field.tag_add('search', begin, end_index)
            self.txt_field.tag_config('search', foreground='green')

Answer 2

使用

try: float(begin)
except ValueError: raise RuntimeError(('could not convert to float', begin))

将字符串转换为float python的问题

2 个答案: