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In [7]: w = '93python22'
In [8]: w.replace('p', '')
Out[8]: '93ython22'
In [9]: w
Out[9]: '93python22'
In [17]: w = '93python22'
In [18]: s = ""
In [19]: for char in w:
...: if char.isdigit():
...: s += char
...:
In [20]: s
Out[20]: '9322'
In [21]:
w = '93python22'
for x in w:
if '0' <= x <= '9':
continue
else:
w = w.replace(x,'')
print(w)