python内函数名加括号和不加括号的区别
import thread
import time
def loop1():
print time.ctime()
time.sleep(2)
print time.ctime()
def loop2():
print time.ctime()
time.sleep(4)
print time.ctime()
if __name__ == '__main__':
thread.start_new_thread(loop1(),())<pre name="code" class="python">import thread
import time
def loop1():
print time.ctime()
time.sleep(2)
print time.ctime()
def loop2():
print time.ctime()
time.sleep(4)
print time.ctime()
if __name__ == '__main__':
thread.start_new_thread(loop1（）,())
thread.start_new_thread(loop2（）,())
time.sleep(6)
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thread.start_new_thread(loop2(),()) time.sleep(6)
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<p>TypeError: first arg must be callable</p>
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<p>返回的错误结果是这个，表示调用的要是一个可 支 配 的函数</p>
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<p>后来我把代码改成了这样</p>
<p> </p>
<p></p><pre name="code" class="html">import thread
import time
def loop1():
print time.ctime()
time.sleep(2)
print time.ctime()
def loop2():
print time.ctime()
time.sleep(4)
print time.ctime()
if __name__ == '__main__':
thread.start_new_thread(loop1,())
thread.start_new_thread(loop2,())
time.sleep(6)
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<p>将thread后面调用的函数名改成了 loop1（ 原来是loop1（）），</p>
<p>在python中，函数名加（），表示返回的是一个函数的结果，不加括号表示的是对函数的调用。</p>
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