Py Functions, own

Question 1

what will be returned from a function in which a return statement is not specified?

Answer 1

]] None
e.g.
]] def hello_fn():
]]     print " Hello world!"
]] def hello2_fn:
]]     print hello_fn()
]] hello2_fn
]] None

Question 2

when to use a single-line or a multi-line comment?

Answer 2

• to explain design decision or changes

”””
Introduction that will appear from the help-function and include versions etc.
“””

Question 3

naming standard, how to prefix the name of a fn returning True or False?

Answer 3

‘is’

]] def is_…

Question 4

how is the keyword in keyed: ‘in’ or ‘IN’?

Answer 4

‘in’ (key word in small letters)

]] if num_p in(1,2,3,4):
]] return True

Question 5

can NOT IN be used?

Answer 5

yes, works as well as ‘in’

]] if num_p not in(1,2,3,4):
]] return False

Question 6

how to use ‘range()’ with ‘in’-condition?

Answer 6

]] if val_p in range( 1,12)

Question 7

how to invoke a global variable ‘greating_message_v’ within a fn?

Answer 7

]] greating_message = ‘Hi, how are you?’
]] def greating( message_p )
]] global greating_message

– a global variable used within a function should explicitly be referenced within the sane

Question 8

how to add, populate values between 0 - 100 to a list?

Answer 8

– option.1
# ]] my_list = [ ] NOTE: not needed
]] range0to100 = range( 0,100,1 )
]] my_list = list( range0to100 )
– built-in fn to create a list
– from Kite

– option.2, worked first but not second time
]] list_start = 0
]] list_end = 100
]] my_list = [ ]
]] my_list.extend( range( list_start, list_end, 1) )
– extend: a built-in function which only takes one argument

Question 9

how to verify whether a provided value is in a range of e.g. 0 - 3600?

Answer 9

]] if in range( 0,3600 ):

• • works fine
• • Kite

Question 10

how to find the number of occurrences of a string in another string?
e.g. ‘red’ in ‘red.blue.red.green.yellow.red’

Answer 10

-- option.1 --
]] c_str = 'red.blue.red.green.yellow.red'
]] print( c_str.count( 'red',0,3 )
]] 1
-- option.2 --
]] print( c_str.count( 'red',0,-1 )
]] 3

Question 11

how to convert a float number into 1 decimal?

Answer 11

]] num_w_decim = round( float_num, 1 )

– round works very well