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>>> def powersum(power, *args):
... '''Return the sum of each argument raised to specified power.'''
... total = 0
... for i in args:
... total += pow(i, power)
... return total
...
>>> powersum(2, 3, 4)
25
>>> powersum(2, 10)
100
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myCoolVariable="some_string"
os.system("echo myCoolVariable")
2.
>>> os.system('echo "asdg"')
asdg
0
>>> os.system("echo 'asdgwere'")
asdgwere
0
3.
$ python
>>>hamburger="potato"
>>>import os
>>>os.system("echo 'hamburger'")
potato
0
......
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Python 3.0 (r30:67507, Dec 3 2008, 20:14:27) [MSC v.1500 32 bit (Intel)] on win32
Type " ......
1.1. Óï·¨
1.1.1. if
>>> x=int(raw_input("please enter an integer:"))
please enter an integer:-8
>>> if x<0:
... print 'negative'
... elif x==0:
... print 'zero'
... else:
... print 'positive'
...
negative
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