Hive有一个选项import tkinter as tk
import tkinter.ttk as ttk
root = tk.Tk()
mainframe = tk.Frame(root)
# Model
class Limiter(ttk.Scale):
""" ttk.Scale sublass that limits the precision of values. """
def __init__(self, *args, **kwargs):
self.precision = kwargs.pop('precision') # Remove non-std kwarg.
self.chain = kwargs.pop('command', lambda *a: None) # Save if present.
super(Limiter, self).__init__(*args, command=self._value_changed, **kwargs)
def _value_changed(self, newvalue):
newvalue = round(float(newvalue), self.precision)
self.winfo_toplevel().globalsetvar(self.cget('variable'), (newvalue))
self.chain(newvalue) # Call user specified function.
# Sample client callback.
def callback(newvalue):
print('callback({!r})'.format(newvalue))
input_var = tk.DoubleVar(value=0.)
spin = tk.Spinbox(mainframe, textvariable=input_var, wrap=True, width=10)
slide = Limiter(mainframe, variable=input_var, orient='horizontal', length=200,
command=callback, precision=4)
spin['to'] = 1.0
spin['from'] = 0.0
spin['increment'] = 0.01
slide['to'] = 1.0
slide['from'] = 0.0
# slide['digits'] = 4
# slide['resolution'] = 0.01
# Layout
weights = {'spin': 1, 'slide': 100}
mainframe.grid_rowconfigure(0, weight=1)
mainframe.grid_columnconfigure(0, weight=weights['spin'])
mainframe.grid_columnconfigure(1, weight=weights['slide'])
spin.grid(row=0, column=0, sticky='news')
slide.grid(row=0, column=1, sticky='news')
root.grid_rowconfigure(0, weight=1)
root.grid_columnconfigure(0, weight=1)
mainframe.grid(row=0, column=0)
root.mainloop()
，使外部表可以跳过文件中的头文件。
因此，如果文件夹包含多个文件，将发生什么情况。有这个疑问，只是验证一下。
答案 0 :(得分：1)
文件夹中每个文件的标题都会被跳过。
如果文件夹（由表指向）具有多个文件。 Hive会跳过文件夹中每个文件的前N行（“ skip.header.line.count” =“ N”）。