If you want to remove leading non-alpha/numeric values:
while not s[0].isalnum(): s = s[1:]
If you want to remove only leading non-alphabet characters:
while not s[0].isalpha(): s = s[1:]
Sample:
s = '!@#yourname!@#'
while not s[0].isalpha(): s = s[1:]
print(s)
Output:
yourname!@#