In the following i have an array where for each element a string should be added at the start and not append ,how can i do this
a=["Hi","Sam","How"]
I want to add "Hello" at the start of each element so that the output will be
Output:
a=["HelloHi","HelloSam","HelloHow"]
This works for a list of strings:
a = ['Hello'+b for b in a]
and this works for other objects too (uses their strings representation):
a = ['Hello{}'.format(b) for b in a]
Example:
a = ["Hi", "Sam", "How", 1, {'x': 123}, None]
a = ['Hello{}'.format(b) for b in a]
# ['HelloHi', 'HelloSam', 'HelloHow', 'Hello1', "Hello{'x': 123}", 'HelloNone']
+ operator you can simply add a call to str. str.format is about 15% slower than using the string concatenation(and more than 50% slower than string concatenation without calling str. Even though probably every solution proposed is efficient enough in almost all situations).
a = ["Index"+str(idx)+". "+array_element for idx,array_element in enumerate(myArray, 1)]. This will produce something like: Index1. ArrayElement1 Index2. Arrayelement2 and so on.a=["Hi","Sam","How"]
a = ["hello" + x for x in a]
print a
or you can use map:
map('Hello{0}'.format,a)
Another option:
>>> def say_hello(foo):
... return 'Hello{}'.format(foo)
...
>>> map(say_hello,['hi','there'])
['Hellohi', 'Hellothere']
