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Python: Check whether a given string is number or not using Lambda

Python Lambda: Exercise-9 with Solution

Write a Python program to check whether a given string is number or not using Lambda.

Sample Solution:

Python Code :

is_num = lambda q: q.replace('.','',1).isdigit()
print(is_num('26587'))
print(is_num('4.2365'))
print(is_num('-12547'))
print(is_num('00'))
print(is_num('A001'))
print(is_num('001'))
print("\nPrint checking numbers:")
is_num1 = lambda r: is_num(r[1:]) if r[0]=='-' else is_num(r)
print(is_num1('-16.4'))
print(is_num1('-24587.11'))

Sample Output:

True
True
False
True
False
True

Print checking numbers:
True
True

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Python: Tips of the Day

Creates a dictionary with the same keys as the provided dictionary and values generated by running the provided function for each value:

Example:

def tips_map_values(obj, fn):
  ret = {}
  for key in obj.keys():
    ret[key] = fn(obj[key])
  return ret
users = {
  'Owen': { 'user': 'Owen', 'age': 29 },
  'Eddie': { 'user': 'Eddie', 'age': 15 }
}

print(tips_map_values(users, lambda u : u['age'])) # {'Owen': 29, 'Eddie': 15}

Output:

{'Owen': 29, 'Eddie': 15}