我正在使用python中的stdout打印输出，但是它保留了要打印的内容最后是空格，并且{
"configurations": [
{
"environments": [
{
"MINGW64_ROOT": "C:\\msys64\\mingw64",
"BIN_ROOT": "${env.MINGW64_ROOT}\\bin",
"FLAVOR": "x86_64-w64-mingw32",
"TOOLSET_VERSION": "7.3.0",
"PATH": "${env.MINGW64_ROOT}\\bin;${env.MINGW64_ROOT}\\..\\usr\\local\\bin;${env.MINGW64_ROOT}\\..\\usr\\bin;${env.MINGW64_ROOT}\\..\\bin;${env.PATH}",
"INCLUDE": "${env.MINGW64_ROOT}\\include\\c++\\${env.TOOLSET_VERSION};${env.MINGW64_ROOT}\\include\\c++\\${env.TOOLSET_VERSION}\\tr1;${env.MINGW64_ROOT}\\include\\c++\\${env.TOOLSET_VERSION}\\${env.FLAVOR};${env.MINGW64_ROOT}\\include",
"environment": "mingw_64"
}
],
"name": "Mingw64-Debug",
"generator": "Ninja",
"configurationType": "Debug",
"inheritEnvironments": [
"mingw_64"
],
"buildRoot": "${env.USERPROFILE}\\CMakeBuilds\\${workspaceHash}\\build\\${name}",
"installRoot": "${env.USERPROFILE}\\CMakeBuilds\\${workspaceHash}\\install\\${name}",
"cmakeCommandArgs": "",
"buildCommandArgs": "-v",
"ctestCommandArgs": "",
"intelliSenseMode": "linux-gcc-x64",
"variables": [
{
"name": "CMAKE_C_COMPILER",
"value": "${env.BIN_ROOT}\\clang.exe"
},
{
"name": "CMAKE_CXX_COMPILER",
"value": "${env.BIN_ROOT}\\clang++.exe"
}
]
}
]
}
总是给我一个错误。下面的代码。
Generic iOS Device我用输入rsplit()得到输出
class Node:
def __init__(self, d):
self.data = d
self.left = None
self.right = None
# function to convert sorted array to a
# balanced BST
# input : sorted array of integers
# output: root node of balanced BST
def sort_array_to_bst(arr):
if not arr:
return None
# find middle
mid = (len(arr)) / 2
mid = int(mid)
# make the middle element the root
root = Node(arr[mid])
# left subtree of root has all
# values <arr[mid]
root.left = sort_array_to_bst(arr[:mid])
# right subtree of root has all
# values >arr[mid]
root.right = sort_array_to_bst(arr[mid + 1:])
return root
# A utility function to print the pre-order
# traversal of the BST
def pre_order(node):
if not node:
return
if root:
sys.stdout.write(node.data + ' ')
pre_order(node.left)
pre_order(node.right)
def no_spaces(s):
return ' '.join(s.rsplit())
if __name__ == '__main__':
arr = []
for line in sys.stdin.readline().strip().split(" "):
arr.append(line)
# arr = [7, 898, 157, 397, 57, 178, 26, 679]
# Output = 178 57 26 157 679 397 898
narr = arr[1:]
print(narr)
narr = sorted(narr, key=int)
root = sort_array_to_bst(narr)
pre_order(root)
7 898 157 397 57 178 26 679用于说明空白，但请注意，在实际输出中，它只是空白。我尝试过
178 57 26 157 679 397 898.，但获得：
`AttributeError：'int'对象没有属性'rsplit'。
我该怎么做，或者有其他选择吗？
答案 0 :(得分：1)
这是在 元素之间仅打印空格的一种方法：
if root:
if node != root:
sys.stdout.write(' ')
sys.stdout.write(str(node.data))
pre_order(node.left)
pre_order(node.right)