->copyLst:', copyLst)
sourceLst[0] = 'changestr'
print('3.->sourceLst:', sourceLst)
print('3....->sourceLst: ['changestr', 'str2', 'str3', 'str4', 'str5', ['str1', 'str2', 'str3', 'str4', 'str5'],...->sourceLst: ['changestr', 'str2', 'str3', 'str4', 'str5', ['str1', 'str2', 'str3', 'str4', 'str5', '