python中字母与ascii码的转换

Ref：https://blog.csdn.net/ifubing/article/details/94281187

---

字符转ascii数字

ord(字符）

数字转字符

chr(数字)

---

应用

基于python实现仿射变换加密

string = "THE NATIONAL SECURITY AGENCY"
rstr = ''
for i in range(len(string)):
  rstr = rstr+chr(((ord(string[i])-ord('A'))*11+23) % 26+ord('A'))
print(rstr)

---