Christmas_tree funciton

we will start from here and then make this better and better.



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In [18]:

    
'''
1. we use keyward and default argumenet below:
'''
def christmas_tree(position=8,size=6):
    ''' christmas_tree:
    print a christmas with different position and size.
    Accept two integers and then draw. If the input are not integers, print " :=(" , return 1 and exit.
    if the input is oversize,  print " :=(" , return 1 and exit.
    
    '''
    #樹枝
    for i in range(0,size):
        print " "*position+" "* (size-i)+"*"*(2*i+1)
    #樹幹
    for i in range(0,3):
        print " "*position+" "*(size-2)+' ***'



In [21]:

    
#we can call this function by keywors. and if one is missing, default is used.
christmas_tree(position=12,size=3)
christmas_tree(position=12)
christmas_tree()









    



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In [22]:

    
#we can use __doc__ to print its document string
print christmas_tree.__doc__









    



 christmas_tree:
    print a christmas with different position and size.
    Accept two integers and then draw. If the input are not integers, print " :=(" , return 1 and exit.
    if the input is oversize,  print " :=(" , return 1 and exit.



In [32]:

    
#Now we check the input
def christmas_tree(position=8,size=6):
    ''' christmas_tree:
    print a christmas with different position and size.
    Accept two integers and then draw. If the input are not integers, print " :=(" , return 1 and exit.
    if the input is oversize,  print " :=(" , return 1 and exit.
    
    '''
    if int(position)!=position:
        print ":-("
        return 1
    
    if int(size)!=size:
        print ":-("
        return 1
    
    #樹枝
    for i in range(0,size):
        print " "*position+" "* (size-i)+"*"*(2*i+1)
    #樹幹
    for i in range(0,3):
        print " "*position+" "*(size-2)+' ***'
        
christmas_tree(8.3,6)
christmas_tree(8,2.1)
christmas_tree(-5,2)
christmas_tree(3,-14)









    



:-(
:-(
  *
 ***
 ***
 ***
 ***
    ***
    ***
    ***



In [33]:

    
#Now we check the input
#we can combine two condition by a "or"
def christmas_tree(position=8,size=6):
    ''' christmas_tree:
    print a christmas with different position and size.
    Accept two integers and then draw. If the input are not integers, print " :=(" , return 1 and exit.
    if the input is oversize,  print " :=(" , return 1 and exit.
    
    '''
    if int(position)!=position or int(size)!=size:
        print ":-("
        return 1
    
    
    #樹枝
    for i in range(0,size):
        print " "*position+" "* (size-i)+"*"*(2*i+1)
    #樹幹
    for i in range(0,3):
        print " "*position+" "*(size-2)+' ***'
        
christmas_tree(8.3,6)
christmas_tree(8,2.1)
christmas_tree(-5,2)
christmas_tree(3,-14)









    



:-(
:-(
  *
 ***
 ***
 ***
 ***
    ***
    ***
    ***



In [41]:

    
#we check the value of position and size
def christmas_tree(position=8,size=6):
    ''' christmas_tree:
    print a christmas with different position and size.
    Accept two integers and then draw. If the input are not integers, print " :=(" , return 1 and exit.
    if the input is oversize,  print " :=(" , return 1 and exit.
    
    '''
    if int(position)!=position or int(size)!=size:
        print ":-("
        return 1
    
    if position<1 or size<1:
        print ":-("
        return 1
    
    if 50<position or 50<size:
        print ":-("
        return 1
    
    #樹枝
    for i in range(0,size):
        print " "*position+" "* (size-i)+"*"*(2*i+1)
    #樹幹
    for i in range(0,3):
        print " "*position+" "*(size-2)+' ***'
        
christmas_tree(8.3,6)
christmas_tree(8,2.1)
christmas_tree(-5,2)
christmas_tree(3,-14)









    



:-(
:-(
:-(
:-(






    Out[41]:





1



In [47]:

    
#actually we can use a built in funciton any() to get all error. 
#
def christmas_tree(position=8,size=6):
    ''' christmas_tree:
    print a christmas with different position and size.
    Accept two integers and then draw. If the input are not integers, print " :=(" , return 1 and exit.
    if the input is oversize,  print " :=(" , return 1 and exit.
    
    '''
    errorlist=[int(position)!=position,int(size)!=size,position<1,size<1,50<position,50<size]
    error=any(errorlist)
    if error:
        print ":-("
        return 1
   
    #樹枝
    for i in range(0,size):
        print " "*position+" "* (size-i)+"*"*(2*i+1)
    #樹幹
    for i in range(0,3):
        print " "*position+" "*(size-2)+' ***'
        
christmas_tree(8.3,6)
christmas_tree(8,2.1)
christmas_tree(-5,2)
christmas_tree(3,-14)









    



:-(
:-(
:-(
:-(






    Out[47]:





1



In [48]:

    
#But what if use input a string?
christmas_tree('a',-14)









    



---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-48-a174f56b2f02> in <module>()
      1 #But what if use input a string?
----> 2 christmas_tree('a',-14)

<ipython-input-47-a4ece0e1f934> in christmas_tree(position, size)
      8 
      9     '''
---> 10     errorlist=[int(position)!=position,int(size)!=size,position<1,size<1,50<position,50<size]
     11     error=any(errorlist)
     12     if error:

ValueError: invalid literal for int() with base 10: 'a'



In [53]:

    
#Acutally a powerful function is provided 
print isinstance(2, int)
print isinstance('asd', int)









    



True
False



In [60]:

    
#actually we can use a built in funciton any() to get all error. 
# and we can use 'not' to inver the result
def christmas_tree(position=8,size=6):
    ''' christmas_tree:
    print a christmas with different position and size.
    Accept two integers and then draw. If the input are not integers, print " :=(" , return 1 and exit.
    if the input is oversize,  print " :=(" , return 1 and exit.
    
    '''
    errorlist=[not isinstance(position, int),not isinstance(size, int),position<1,size<1,50<position,50<size]
    print errorlist
    error=any(errorlist)
    if error:
        print ":-("
        return 1
   
    #樹枝
    for i in range(0,size):
        print " "*position+" "* (size-i)+"*"*(2*i+1)
    #樹幹
    for i in range(0,3):
        print " "*position+" "*(size-2)+' ***'

christmas_tree(8.3,6)
christmas_tree(8,2.1)
christmas_tree(-5,2)
christmas_tree(3,-14)
christmas_tree('a',-14)









    



[True, False, False, False, False, False]
:-(
[False, True, False, False, False, False]
:-(
[False, False, True, False, False, False]
:-(
[False, False, False, True, False, False]
:-(
[True, False, False, True, True, False]
:-(






    Out[60]:





1



In [61]:

    
for i in range(1,40,5):
    christmas_tree(i,i)









    



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