Erict调试python的sys.argv下标问题

    刚接触python没多久，不免会弄出些奇怪的问题。今天在eric环境下调试python时发现在设置sys.argv[1]的参数
时莫名奇妙调试不过去，非得从sys.argv[2]起始才能解析参数。
1.参数若设置如下2开始在eric debug的时候F2运行如下界面
hours,mins = sys.argv[2].split(":")

2.在hours,mins = sys.argv[2].split(":")设置为1在F2的时候

3.在Konsole中运行的时候 python ui.py 16:32；hours,mins = sys.argv[1].split(":")

4.若改为hours,mins = sys.argv[2].split(":")，运行出错
xtramus@ubuntu:/usr/local/share/gnuradio/N210/UI$ python ui.py 16:32
Traceback (most recent call last):
  File "ui.py", line 18, in
    hours,mins = sys.argv[2].split(":")
IndexError: list index out of range
xtramus@ubuntu:/usr/local/share/gnuradio/N210/UI$

难道是eric的sys.argv的参数解析是从下标1开始的？

附代码
#!/usr/bin/env python
import sys
import time
from PyQt4.QtCore import (QTime, QTimer, Qt, SIGNAL)
from PyQt4.QtGui import (QApplication, QLabel)

app =QApplication(sys.argv)
print "sys.argv[0]%s\n"%sys.argv[0]
print "sys.argv[1]%s\n"%sys.argv[1]
print "sys.argv[2]%s\n"%sys.argv[2:]
try :
    due = QTime.currentTime()
    message = "Alert"
    if len(sys.argv) < 2:
        raise ValueError
    hours,mins = sys.argv[1].split(":")
    due = QTime(int(hours), int(mins))
    if not due.isValid():
        raise ValueError
    if len(sys.argv) > 2:
        message = " ".join(sys.argv[2:])
except ValueError:
    message = "Usage: alert.pyw HH:MM[optional message]"#24hr clock
while QTime.currentTime() < due:
    time.sleep(20)


label =QLabel("{0}" .format(message))
label.setWindowFlags(Qt.SplashScreen)
label.show()
QTimer.singleShot(20000, app.quit)
app.exec_()