#coding : utf-8
import os
import time
a = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
print (a[13],a[20])
print(a, len(a))



str= ""
for i in range (0,len(a),1):
    str +=a[i]
    print("\r"+ str, end=" ")
    time.sleep(0.5)
print("\n")


str= ""
for i in range (-1,len(a)-1,-1):
    str +=a[i]
    print("\r"+ str, end=" ")
    time.sleep(0.5)
print("\n")
    
str =""
i = -1
while i >= -len(a):
    str += a[i]
    print ("\r" + str, end = " ")
    i -= 1
    time.sleep(0.5)
print("\n")


#スライス
print(a[2:10], a[-5:], a[:7],a[13:])

os.system("clear")
b = "幸せはもうすでに出来上がっているものじゃない。自分の行動が引き付けるものだ。"

k = 30

for i in range(0,len(b)-k,1):
    print("\r"+b[i:i+k],end="")
    time.sleep(0.5)
    
for j in range(i,len(b),1):
    print("\r"+ b[j:]+"　",end="")
    time.sleep(0.5)
    
print("\n")

実行結果