Python: Get all possible two digit letter combinations from a digit string
Python Basic - 1: Exercise-13 with Solution
Write a Python program to get all possible two-digit letter combinations from a 1-9 digit string.
string_maps = {
"1": "abc",
"2": "def",
"3": "ghi",
"4": "jkl",
"5": "mno",
"6": "pqrs",
"7": "tuv",
"8": "wxy",
"9": "z"
}
Pictorial Presentation:

Sample Solution:
Python Code:
def letter_combinations(digits):
if digits == "":
return []
string_maps = {
"1": "abc",
"2": "def",
"3": "ghi",
"4": "jkl",
"5": "mno",
"6": "pqrs",
"7": "tuv",
"8": "wxy",
"9": "z"
}
result = [""]
for num in digits:
temp = []
for an in result:
for char in string_maps[num]:
temp.append(an + char)
result = temp
return result
digit_string = "47"
print(letter_combinations(digit_string))
digit_string = "29"
print(letter_combinations(digit_string))
Sample Output:
['jt', 'ju', 'jv', 'kt', 'ku', 'kv', 'lt', 'lu', 'lv'] ['dz', 'ez', 'fz']
Flowchart:

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Previous: Write a Python program to create all possible permutations from a given collection of distinct numbers.
Next: Write a Python program to add two positive integers without using the '+' operator.
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Python: Tips of the Day
Returns the symmetric difference between two iterables, without filtering out duplicate values:
Example:
def tips_symmetric_difference(p, q): _p, _q = set(p), set(q) return [item for item in p if item not in _q] + [item for item in q if item not in _p] print(tips_symmetric_difference([2, 4, 6], [2, 4, 8]))
Output:
[6, 8]
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