用pyqt写出：按下无重复子串”按钮后，在左侧文本框输出字符串“abcbaccabqwer”的所有无重复连续子串，每行显示一个子串，参考下图。同时，按下“最大长度”按钮后，在其右侧小文本框输出最长子串的长度。参考方法：①创建一个数组；②从第一个字符开始遍历，不重复的字符就将它放到新的数组中，遇到重复的就停止。

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QHBoxLayout, QLabel, QLineEdit, QTextEdit, QPushButton

class SubstringWindow(QWidget):
def __init__(self):
super().__init__()

self.setWindowTitle("Substring Window")
self.setGeometry(100, 100, 400, 300)

self.input_label = QLabel("Input String:")
self.input_lineedit = QLineEdit()
self.output_label = QLabel("Substring List:")
self.output_textedit = QTextEdit()
self.length_button = QPushButton("Max Length")
self.substring_button = QPushButton("Substrings")

self.length_button.clicked.connect(self.calculate_max_length)
self.substring_button.clicked.connect(self.calculate_substrings)

layout = QVBoxLayout()
layout.addWidget(self.input_label)
layout.addWidget(self.input_lineedit)
layout.addWidget(self.output_label)
layout.addWidget(self.output_textedit)
layout.addWidget(self.length_button)
layout.addWidget(self.substring_button)

self.setLayout(layout)

def calculate_max_length(self):
input_string = self.input_lineedit.text()
max_length = 0

for i in range(len(input_string)):
substring = []
for j in range(i, len(input_string)):
if input_string[j] not in substring:
substring.append(input_string[j])
else:
break
max_length = max(max_length, len(substring))

self.output_textedit.setText(str(max_length))

def calculate_substrings(self):
input_string = self.input_lineedit.text()
substrings = []

for i in range(len(input_string)):
substring = ""
for j in range(i, len(input_string)):
if input_string[j] not in substring:
substring += input_string[j]
else:
break
substrings.append(substring)

self.output_textedit.setText("\n".join(substrings))

if __name__ == "__main__":
app = QApplication(sys.argv)

window = SubstringWindow()
window.show()

sys.exit(app.exec_())