在列表中找不到字符串

Question

我正在查找列表中存在的字符串，以获取字符串的索引，以便将列表 B 的内容插入列表 A。

我的代码显示该字符串不在列表中，我不知道为什么（因为它在那里！）。谢谢！

HEADER = ['ROAD_ID: R1.6', 'ROAD_TYPE: Curve', 'ARC_RADIUS: 1650.000000', 'SPIRAL_LEN1: 300.000000', 'SPIRAL_LEN2: 300.000000', 'SUPERELEVATION: 0.030000', 'CONTROL_POINT: 56551.970145 41423.581706 117.415152', 'VCURVE_LEN: 1298.247591', 'VCURVE_MIN: 20.000000', 'SLOPE1: 0.020632', 'SLOPE2: 0.019981', 'PATHNAME: Default Road', 'SPEED: 45.000000', 'NO_PASSING: FALSE', 'STORE_HPR: FALSE', 'NUM_POINTS: 130']
K_WIDTH = 'WIDTH: '
W_REC = ['PROFILE_POINT: 25.500 0.000','PROFILE_POINT: -25.500 0.00','WIDTH: 51.000','CENTER2LEFT: 25.500']
what = 'PATHNAME:'

for n in HEADER:
    print n, type(n)
    if what in n:
        print '////////////////////'
        print 'Found:', what, type(n)

if not K_WIDTH in HEADER:
    print 'Looking for:', what

    if what in HEADER:
        where = HEADER.index(what)
        HEADER.insert(where,w_rec)
    else:
        print 'Not found', what

输出：

ROAD_ID: R1.6 <type 'str'>
ROAD_TYPE: Curve <type 'str'>
ARC_RADIUS: 1650.000000 <type 'str'>
SPIRAL_LEN1: 300.000000 <type 'str'>
SPIRAL_LEN2: 300.000000 <type 'str'>
SUPERELEVATION: 0.030000 <type 'str'>
CONTROL_POINT: 56551.970145 41423.581706 117.415152 <type 'str'>
VCURVE_LEN: 1298.247591 <type 'str'>
VCURVE_MIN: 20.000000 <type 'str'>
SLOPE1: 0.020632 <type 'str'>
SLOPE2: 0.019981 <type 'str'>
PATHNAME: Default Road <type 'str'>
////////////////////
Found: PATHNAME: <type 'str'>
SPEED: 45.000000 <type 'str'>
NO_PASSING: FALSE <type 'str'>
STORE_HPR: FALSE <type 'str'>
NUM_POINTS: 130 <type 'str'>
Looking for: PATHNAME:
Not found PATHNAME:

Answer 1

我认为问题是当你定义what时，它被定义为'PATHNAME: '。这个 str 本身不在列表中，它只是字符串的一部分，程序无法识别。要修复它，我会将 what 更改为等于 'PATHNAME: Default Road'。我在一个程序中对此进行了测试，它似乎感觉到它在那里。希望对您有所帮助。

Answer 2

您可以尝试迭代并查找是否有匹配您的子字符串

代码

HEADER = ['ROAD_ID: R1.6', 'ROAD_TYPE: Curve', 'ARC_RADIUS: 1650.000000', 'SPIRAL_LEN1: 300.000000', 'SPIRAL_LEN2: 300.000000', 'SUPERELEVATION: 0.030000', 'CONTROL_POINT: 56551.970145 41423.581706 117.415152', 'VCURVE_LEN: 1298.247591', 'VCURVE_MIN: 20.000000', 'SLOPE1: 0.020632', 'SLOPE2: 0.019981', 'PATHNAME: Default Road', 'SPEED: 45.000000', 'NO_PASSING: FALSE', 'STORE_HPR: FALSE', 'NUM_POINTS: 130']
K_WIDTH = 'WIDTH: '
W_REC = ['PROFILE_POINT: 25.500 0.000','PROFILE_POINT: -25.500 0.00','WIDTH: 51.000','CENTER2LEFT: 25.500']
what = 'PATHNAME:'

for n in HEADER:
    print n, type(n)
    if what in n:
        print '////////////////////'
        print 'Found:', what, type(n)

if not K_WIDTH in HEADER:
    print 'Looking for:', what

    found = 0
    for i in range(0,len(HEADER)):
        if what in HEADER[i]:
            found = 1
            HEADER.insert(i,W_REC)
    if found == 0:
        print 'Not found', what

Answer 3

子字符串 PATHNAME: 是名为 HEADER 的字符串变量列表的一部分。因此，您必须遍历每个单独的字符串并将其与您的子字符串匹配，就像这样 if what in s for s in HEADER，更新后的代码如下：

HEADER = ['ROAD_ID: R1.6', 'ROAD_TYPE: Curve', 'ARC_RADIUS: 1650.000000', 'SPIRAL_LEN1: 300.000000', 'SPIRAL_LEN2: 300.000000', 'SUPERELEVATION: 0.030000', 'CONTROL_POINT: 56551.970145 41423.581706 117.415152',
          'VCURVE_LEN: 1298.247591', 'VCURVE_MIN: 20.000000', 'SLOPE1: 0.020632', 'SLOPE2: 0.019981', 'PATHNAME: Default Road', 'SPEED: 45.000000', 'NO_PASSING: FALSE', 'STORE_HPR: FALSE', 'NUM_POINTS: 130']
K_WIDTH = 'WIDTH: '
W_REC = ['PROFILE_POINT: 25.500 0.000', 'PROFILE_POINT: -25.500 0.00',
         'WIDTH: 51.000', 'CENTER2LEFT: 25.500']
what = 'PATHNAME:'

for n in HEADER:
    print n, type(n)
    if what in n:
        print '////////////////////'
        print 'Found:', what, type(n)

if not K_WIDTH in HEADER:
    print 'Looking for:', what

    where = [HEADER.index(i) for i in HEADER if what in i]
    if (where):
        HEADER.insert(where[0], w_rec)
    else:
        print 'Not found', what

在列表中找不到字符串

not finding string in list

python

string

element

list