Python 如何获取元组的第一行和元组中的第三项。有人需要帮忙吗？

我将这些值存储在：

a = (1.425, 4.82145395112958, 0.0656498375731458)
    (1.39716316090366, 7.2, 0.102480129941483)
    (7.425, 4.82145395112958, 0.0656498375731458)
    (7.39716316090366, 7.2, 0.102480129941483)
    (7.425, -0.928546048870416, 0.0656498375731458)
    (7.39716316090366, 0.95, 0.102480129941483)
    (1.425, -0.928546048870416, 0.0656498375731458)
    (1.39716316090366, 0.95, 0.102480129941483)

print a[2]

输出：

0.0656498375731458
0.102480129941483
0.0656498375731458
0.102480129941483
0.0656498375731458
0.102480129941483
0.0656498375731458
0.102480129941483

我也试过：

print a[0][2]

为此：

print a[0][2]

我有一个错误：

Traceback (most recent call last):
File "D:\Py\check cartesian.py", line 26, in <module>
print a[0][2]
TypeError: 'float' object has no attribute '__getitem__'

---

您编写了不带主括号的元组，这很有效：

a = ((1.425, 4.82145395112958, 0.0656498375731458, ), 
    (1.39716316090366, 7.2, 0.102480129941483, ), 
    (7.425, 4.82145395112958, 0.0656498375731458, ), 
    (7.39716316090366, 7.2, 0.102480129941483, ), 
    (7.425, -0.928546048870416, 0.0656498375731458, ), 
    (7.39716316090366, 0.95, 0.102480129941483, ), 
    (1.425, -0.928546048870416, 0.0656498375731458, ), 
    (1.39716316090366, 0.95, 0.102480129941483, ), )

print(a[0][2])

---

您编写了不带主括号的元组，这很有效：

a = ((1.425, 4.82145395112958, 0.0656498375731458, ), 
    (1.39716316090366, 7.2, 0.102480129941483, ), 
    (7.425, 4.82145395112958, 0.0656498375731458, ), 
    (7.39716316090366, 7.2, 0.102480129941483, ), 
    (7.425, -0.928546048870416, 0.0656498375731458, ), 
    (7.39716316090366, 0.95, 0.102480129941483, ), 
    (1.425, -0.928546048870416, 0.0656498375731458, ), 
    (1.39716316090366, 0.95, 0.102480129941483, ), )

print(a[0][2])

---

您也可以尝试使用列表

a = [(1.425, 4.82145395112958, 0.0656498375731458), 
    (1.39716316090366, 7.2, 0.102480129941483), 
    (7.425, 4.82145395112958, 0.0656498375731458), 
    (7.39716316090366, 7.2, 0.102480129941483), 
    (7.425, -0.928546048870416, 0.0656498375731458), 
    (7.39716316090366, 0.95, 0.102480129941483), 
    (1.425, -0.928546048870416, 0.0656498375731458 ), 
    (1.39716316090366, 0.95, 0.102480129941483), ]
print(a[0][2])

---

您也可以尝试使用列表

a = [(1.425, 4.82145395112958, 0.0656498375731458), 
    (1.39716316090366, 7.2, 0.102480129941483), 
    (7.425, 4.82145395112958, 0.0656498375731458), 
    (7.39716316090366, 7.2, 0.102480129941483), 
    (7.425, -0.928546048870416, 0.0656498375731458), 
    (7.39716316090366, 0.95, 0.102480129941483), 
    (1.425, -0.928546048870416, 0.0656498375731458 ), 
    (1.39716316090366, 0.95, 0.102480129941483), ]
print(a[0][2])

---

你确定a和你写的一模一样吗？如果a是一个元组的元组，那么您缺少开头的

（

）和结尾的

。您确定a与您的编写方式完全一致吗？如果a是一个元组的元组，那么你就缺少了开头的
（
）

。我没有写这个元组，我从我的文件中得到了它们，这些是我得到的精确坐标。我没有写这个元组，我从我的文件中得到了它们，这些是我得到的精确坐标。如何制作一个列表？我对python非常陌生。如何制作列表？我对python非常陌生。