How to dynamically print list values?

Question

This Code Works Fine.....But it's like static. I don't know what to do to make it work in dynamic way? I want:- When user inputs 3 number of cities it should give

a="You would like to visit "+li[0]+" as city 1 and " +li[1]+ " as city 2 and "+li[2]+" as city 3 on your trip"

Similaraly when input is 5 cities it should go to 5 times

li = []
global a

number_of_cities = int(raw_input("Enter Number of Cities -->"))
for city in range(number_of_cities):
   li.append(raw_input("Enter City Name -->"))
print li
a="You would like to visit "+li[0]+" as city 1 and " +li[1]+ " as city 2 and "+li[2]+" as city 3 on your trip"      
print a
a = a.split(" ")
print "\nSplitted First Sentence looks like"
print a
print "\nJoined First Sentence and added 1"
index = 0
for word in a:
   if word.isdigit():
      a[index] = str(int(word)+1)
   index += 1
print " ".join(a)

Can you fix your indentation?

vishes_shell
– vishes_shell

2016-10-12 10:26:11 +00:00
Commented Oct 12, 2016 at 10:26 — vishes_shell
– vishes_shell, Commented Oct 12, 2016 at 10:26

Alex · Accepted Answer · 2016-10-12 10:30:51Z

2

You should do something like this

a = 'You would like to visit ' + ' and '.join('{0} as city {1}'.format(city, index) for index, city in enumerate(li, 1)) + ' on your trip'

answered Oct 12, 2016 at 10:30

Alex

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4 Comments

Stavan Shah Over a year ago

But what does '{0} as city {1}' in your code mean??

nostradamus Over a year ago

If the arguments in format are in the same order as the references {} in the string, the numbers are optional.

Alex Over a year ago

@StavanShah it is string formatting you can read about it here: docs.python.org/2/library/stdtypes.html#str.format

Alex Over a year ago

@nostradamus numbers are optional, but if you explicitly specify them, you format function will work slightly faster

Ilja Everilä · Accepted Answer · 2016-10-12 10:42:46Z

0

You can build the string with a combination of string formatting, str.join and enumerate:

a = "You would like to visit {} on your trip".format(
    " and ".join("{} as city {}".format(city, i)
                 for i, city in enumerate(li, 1)))

str.join() is given a generator expression as the iterable argument. The curly braces ({}) in the strings are replacement fields (placeholders), which will be replaced by positional arguments when formatting. For example

'{} {}'.format('a', 'b')

will produce the string "a b", as will

# explicit positional argument specifiers
'{0} {1}'.format('a', 'b')

edited Oct 12, 2016 at 10:42

answered Oct 12, 2016 at 10:32

Ilja Everilä

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Comments

Blackbeard · Accepted Answer · 2016-10-12 11:02:00Z

0

create another for loop and save your cities to an array. afterwords, concat the array using "join" and put put everything inside the string:

cities = []
for i in range(0,len(li), 1):
    cities.append("%s as city %i" % (li[i], i))

cities_str = " and ".join(cities)
a = "You would like to visit %s on your trip" % (cities_str) # edited out the + sign

edited Oct 12, 2016 at 11:02

answered Oct 12, 2016 at 10:37

Blackbeard

1173 bronze badges

1 Comment

Blackbeard Over a year ago

sorry, it should be like this: a = "You would like to visit %s on your trip" % (cities_str)

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