Learn Python the Hard Way

Exercise 8

Rodrigo Zerbini on Thu, 2011-01-27 02:06

Go back to: General discussion

Here is my code with commentaries and output for exercise 8.

CODE

# formatter will be our variable with 4 places

formatter = "%r %r %r %r"

# here we call formatter to print 4 numbers

print formatter % (1, 2 , 3, 4)

# here we call formatter to print four words

print formatter % ("one", "two", "three", "four")

# here we call formatter to print four values

print formatter % (True, False, False, True)

# here we call formatter to print itself 4 times

print formatter % (formatter, formatter, formatter, formatter)

# here we call formatter to print 4 strings

print formatter % (

"I had this thing.",

"That you could type up right.",

"But it didn't sing.",

"So I said goodnight."

)

OUTPUT

1 2 3 4

'one' 'two' 'three' 'four'

True False False True

'%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r'

'I had this thing.' 'That you could type up right.' "But it didn't sing." 'So I said goodnight.'

EXTRA CREDIT

I don't know why the "But it didn't sing." was printed with double quotes and the other strings with single quotes.
It doesn't make sense to me because all of them came by %r.
Anyone?

ZM L

Thu, 2011-01-27 05:48

Well because "didn't" had a single quote in it, If they print it with single qute then your string would be 'But it didn' instead.

link to this comment

Rodrigo Zerbini

Thu, 2011-01-27 06:49

Thanks ZM! I got it!

I've made some tests and it worked like you said: usually the strings are printed with single quotes, but for those with single quotes the terminal prints with double quotes.

link to this comment

michael chang

Wed, 2011-02-02 23:07

So if you want to print a single quote, you need to wrap your variable with double quote like the exercise: "didn't"

If you want to print a double quote, you need to wrap your variable with single quote like: '"okay?"'

What if you want to print the following (including all punctuation): "What's up?"

link to this comment

nagarjuna c

Thu, 2011-02-03 12:43

formatter ="%r %r %r %r"
print formatter % (1,2,3,4)
print formatter % ('one',"two","three","four")
print formatter % (True, False, False, True)
print formatter % ( formatter,formatter,formatter,formatter)
print formatter % (
"I ahev this thing",
"That you could type up right",
"But it dint sing",
'so I said goodnight.'
)

thats my code and

my out put as

C:\lphw>python ex8.py
1 2 3 4
'one' 'two' 'three' 'four'
True False False True
'%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r'
'I ahev this thing' 'That you could type up right' 'But it dint sing' 'so I said
goodnight.'

but i dont undersnad the out of mine is different from the author

link to this comment

Red Olaf

Fri, 2011-02-04 02:30

You misspelled "didn't" as "dint" in your code so you won't get the double quotes on that string, I believe.

link to this comment

nagarjuna c

Fri, 2011-02-04 08:02

Yes you are right. Now i got double quotes. Can you tell me if i am correct to assume that.. when there is single quote inside a string the whole string will be displayed in double quote .. am i correct.

link to this comment

Dorene DeMars

Wed, 2011-02-09 08:36

Here is my code...ran fine the first time. I played around with the ' in the contraction in the last line and that made the difference for whether or not I got the double quotes.

formatter = "%r %r %r %r"

print formatter % (1,2,3,4)
print formatter % ("one", "two", "three", "four")
print formatter % (True, False, False, True)
print formatter % (formatter, formatter, formatter, formatter)
print formatter % (
"I had this thing.",
"That you could type up right.",
"But it didn't sing.",
"So I said goodnight."
)

link to this comment

Learn Python the Hard Way

My recent threads

Recently updated threads

Exercise 8