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Python: Check whether a given string has a capital letter, a lower case letter, a number and specified length

Python String: Exercise-88 with Solution

Write a Python program to check whether a given string contains a capital letter, a lower case letter, a number and a minimum length.

Sample Solution:-

Python Code:

def check_string(s):
    messg = []
    if not any(x.isupper() for x in s):
        messg.append('String must have 1 upper case character.')
    if not any(x.islower() for x in s):
        messg.append('String must have 1 lower case character.')
    if not any(x.isdigit() for x in s):
        messg.append('String must have 1 number.')
    if len(s) < 8:
        messg.append('String length should be atleast 8.')    
    if not messg:
        messg.append('Valid string.')
    return messg
    
s = input("Input the string: ")
print(check_string(s))

Sample Output:

Input the string:  W3resource
['Valid string.']

Flowchart:

Flowchart: Check whether a given string has a capital letter, a lower case letter, a number and specified length.

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Previous: Write a Python program find the common values that appear in two given strings.
Next: Write a Python program to remove unwanted characters from a given string.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m