Dialog with Python: Difference between revisions
(New page: This exercise is slightly modifed from the "python crash course" http://groups.google.com/group/pythoncrashclass?hl=en <code> Type the following into the Python interpreter and record the...) |
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This exercise is slightly modifed from the "python crash course" http://groups.google.com/group/pythoncrashclass?hl=en | This exercise is slightly modifed from the "python crash course" http://groups.google.com/group/pythoncrashclass?hl=en | ||
# based on exercise from "python crash course" http://groups.google.com/group/pythoncrashclass?hl=en | |||
<code> | <code> | ||
Type the following into the Python interpreter and record the results & any questions / comments you have. NB: the " | Type the following into the Python interpreter and record the results & any questions / comments you have. NB: the ">>>" indicates the "prompt" (what Python prints to ask you to type something to it) -- so you don't type it! | ||
>>> 1 | |||
>>> -1 | |||
>>> 1- | |||
>>> 1 = 2 | |||
>>> 1 == 2 | |||
>>> 1 != 2 | |||
>>> 1 < 2 | |||
>>> 1 <=1 | |||
>>> 1 > 2 | |||
>>> 1 <= 1 | |||
>>> 1 > 2 | |||
>>> 1 < 3 < 5 | |||
>>> 1 < 3 and 3 < 5 | |||
>>> 1 < 3 < 5 | |||
>>> 1 < 3 and 3 < 2 | |||
>>> 1 == 1 == 1 | |||
>>> 1 * 2 | |||
>>> 1 + 2 | |||
>>> 1 / 2 | |||
>>> 1 / 2.0 | |||
>>> 1 // 2.0 | |||
the % sign is the mod operator. It gives the remainder involved. | the % sign is the mod operator. It gives the remainder involved. | ||
| Line 36: | Line 38: | ||
4/6 = is .6 with a remainder of 4 | 4/6 = is .6 with a remainder of 4 | ||
>>> 9 % 2 | |||
>>> 10 % 3 | |||
>>> int | |||
>>> int(2) | |||
>>> int(2.0) | |||
>>> int(2.1) | |||
>>> int(2.9) | |||
>>> int("2.0") | |||
>>> int("four") | |||
>>> long(4) | |||
>>> 4 == 4L | |||
>>> float(2) | |||
>>> float('2') | |||
>>> float('2.9') | |||
>>> 1/0 | |||
>>> 1 + 1.0 | |||
>>> 1 + 1L | |||
>>> 1.0 + 1L | |||
>>> 1<2 and 2<3 | |||
>>> 1<2 and 2<3 | |||
>>> 1<2 and not (2<3) | |||
>>> 1<2 and True | |||
>>> 1<2 and False | |||
>>> 2 & 4 | |||
>>> 2 | 4 | |||
>>> ~2 | |||
>>> 2 << 1 | |||
>>> 2 << 2 | |||
>>> abs(4) | |||
>>> abs(-4) | |||
>>> pow(2,8) | |||
>>> 2**8 | |||
>>> 2 ** 16 | |||
>>> 2 ** 32 | |||
>>> 2 ** 31 | |||
>>> int ( 2 ** 31-1) | |||
>>> int( 2 ** 31-1) + 1 | |||
>>> round(1.01) | |||
>>> round(1.99) | |||
>>> round(1.50) | |||
>>> round (1.59) | |||
>>> 1/3.0 | |||
>>> third = 1/3.0 | |||
>>> round(third) | |||
>>> round(third, 1) | |||
>>> round(third, 2) | |||
>>> round(third, 3) | |||
>>> round(1234.56, -1) | |||
>>> round(1234.56, -2) | |||
>>> round(1234.56, -3) | |||
>>> type(int) | |||
>>> callable(int) | |||
>>> int() | |||
>>> 0 == int() | |||
>>> 0 is int() | |||
>>> type(int) | |||
>>> type(int()) | |||
>>> int(4,3) | |||
>>> int('4') | |||
>>> int("four") | |||
>>> int('z') | |||
>>> int('c', 16) | |||
>>> int("101", 2) | |||
>>> 'hello' | |||
>>> "hello" | |||
>>> 'bob's your uncle' | |||
>>> 'bob\'s your uncle' | |||
>>> "bob's your uncle" | |||
>>> 'A quote (") mark' | |||
>>> '''bob's your "uncle"''' | |||
>>> 'hello | |||
>>> """hello | |||
>>> 'hello\nthere\n\n' | |||
>>> 'h' in 'hello' | |||
>>> 'h' not in 'hello' | |||
>>> 'hello'[0] | |||
>>> s = 'hello' | |||
>>> s[0] = 'j' | |||
>>> r'hello' | |||
>>> r'hello' is 'hello' | |||
>>> r'hello\n' | |||
>>> r'hello\n' == 'hello\n' | |||
>>> len(r'hello\n') | |||
>>> len('hello\n') | |||
>>> 2 * 'hello' | |||
>>> 2 + 'hello' | |||
>>> '2' + 'hello' | |||
>>> u'hello' | |||
>>> type(u'hello') | |||
>>> len('hello') | |||
>>> min('hello') | |||
>>> max('hello') | |||
>>> sorted('hello') | |||
>>> 'hello'.startswith('h') | |||
>>> 'hello'.startswith('he') | |||
>>> 'hello'.startswith('lo') | |||
>>> 'hello'.endswith('lo') | |||
>>> ' hello '.strip() | |||
>>> ' hello '.rstrip() | |||
>>> ' hello '.lstrip() | |||
>>> sorted('hello') | |||
>>> sorted('hello', reverse= True) | |||
>>> reversed('hello') | |||
>>> list(reversed('hello')) | |||
>>> 'hello'.upper() | |||
>>> 'HELLO'.isupper() | |||
>>> 'hello'.title() | |||
>>> 'Hello'.istitle() | |||
>>> 'hello world'.title() | |||
>>> 'hello world'.title().swapcase() | |||
>>> '!' in '.?!' | |||
</code> | </code> | ||
Revision as of 13:08, 7 October 2008
This exercise is slightly modifed from the "python crash course" http://groups.google.com/group/pythoncrashclass?hl=en
- based on exercise from "python crash course" http://groups.google.com/group/pythoncrashclass?hl=en
Type the following into the Python interpreter and record the results & any questions / comments you have. NB: the ">>>" indicates the "prompt" (what Python prints to ask you to type something to it) -- so you don't type it!
>>> 1
>>> -1
>>> 1-
>>> 1 = 2
>>> 1 == 2
>>> 1 != 2
>>> 1 < 2
>>> 1 <=1
>>> 1 > 2
>>> 1 <= 1
>>> 1 > 2
>>> 1 < 3 < 5
>>> 1 < 3 and 3 < 5
>>> 1 < 3 < 5
>>> 1 < 3 and 3 < 2
>>> 1 == 1 == 1
>>> 1 * 2
>>> 1 + 2
>>> 1 / 2
>>> 1 / 2.0
>>> 1 // 2.0
the % sign is the mod operator. It gives the remainder involved.
so, a % b = remainder of a/b such that
if a=6 and b=4 then remainder = 2
if a=4 and b=6 then remainder = 4
this is because
6/4 = is 1 with a remainder of 2
4/6 = is .6 with a remainder of 4
>>> 9 % 2
>>> 10 % 3
>>> int
>>> int(2)
>>> int(2.0)
>>> int(2.1)
>>> int(2.9)
>>> int("2.0")
>>> int("four")
>>> long(4)
>>> 4 == 4L
>>> float(2)
>>> float('2')
>>> float('2.9')
>>> 1/0
>>> 1 + 1.0
>>> 1 + 1L
>>> 1.0 + 1L
>>> 1<2 and 2<3
>>> 1<2 and 2<3
>>> 1<2 and not (2<3)
>>> 1<2 and True
>>> 1<2 and False
>>> 2 & 4
>>> 2 | 4
>>> ~2
>>> 2 << 1
>>> 2 << 2
>>> abs(4)
>>> abs(-4)
>>> pow(2,8)
>>> 2**8
>>> 2 ** 16
>>> 2 ** 32
>>> 2 ** 31
>>> int ( 2 ** 31-1)
>>> int( 2 ** 31-1) + 1
>>> round(1.01)
>>> round(1.99)
>>> round(1.50)
>>> round (1.59)
>>> 1/3.0
>>> third = 1/3.0
>>> round(third)
>>> round(third, 1)
>>> round(third, 2)
>>> round(third, 3)
>>> round(1234.56, -1)
>>> round(1234.56, -2)
>>> round(1234.56, -3)
>>> type(int)
>>> callable(int)
>>> int()
>>> 0 == int()
>>> 0 is int()
>>> type(int)
>>> type(int())
>>> int(4,3)
>>> int('4')
>>> int("four")
>>> int('z')
>>> int('c', 16)
>>> int("101", 2)
>>> 'hello'
>>> "hello"
>>> 'bob's your uncle'
>>> 'bob\'s your uncle'
>>> "bob's your uncle"
>>> 'A quote (") mark'
>>> bob's your "uncle"
>>> 'hello
>>> """hello
>>> 'hello\nthere\n\n'
>>> 'h' in 'hello'
>>> 'h' not in 'hello'
>>> 'hello'[0]
>>> s = 'hello'
>>> s[0] = 'j'
>>> r'hello'
>>> r'hello' is 'hello'
>>> r'hello\n'
>>> r'hello\n' == 'hello\n'
>>> len(r'hello\n')
>>> len('hello\n')
>>> 2 * 'hello'
>>> 2 + 'hello'
>>> '2' + 'hello'
>>> u'hello'
>>> type(u'hello')
>>> len('hello')
>>> min('hello')
>>> max('hello')
>>> sorted('hello')
>>> 'hello'.startswith('h')
>>> 'hello'.startswith('he')
>>> 'hello'.startswith('lo')
>>> 'hello'.endswith('lo')
>>> ' hello '.strip()
>>> ' hello '.rstrip()
>>> ' hello '.lstrip()
>>> sorted('hello')
>>> sorted('hello', reverse= True)
>>> reversed('hello')
>>> list(reversed('hello'))
>>> 'hello'.upper()
>>> 'HELLO'.isupper()
>>> 'hello'.title()
>>> 'Hello'.istitle()
>>> 'hello world'.title()
>>> 'hello world'.title().swapcase()
>>> '!' in '.?!'