something problems in Python code

import gurobipy 
from gurobipy import * 
m = Model("mip1") 
# 创建常量 
pbuy = 0.27 
psold = 0.13 
gsold = 0.2 
gbuy = 0.4 
pload = 56.079715030976004 
hload = 40.37739482230272 
gload = 43.768518510060744 
ppv = 0 
pwt = 23.264563195 
pp2g = 63.27525490012397 
gchp1 = 0 
gchp2 = 0 
pess = -24.078819315855416 
hess = 0 
peb = 44.73949564798085 
# 创建变量 
pp2g_delta = m.addVar(vtype=GRB.CONTINUOUS, name="pp2g_delta") 
gchp1_delta = m.addVar(vtype=GRB.CONTINUOUS, name="gchp1_delta") 
pess_delta = m.addVar(vtype=GRB.CONTINUOUS, name="pess_delta") 
gchp2_delta = 0.8 * gchp1_delta 
# 定义辅助变量 
part1_switch = m.addVar(vtype=GRB.BINARY, name="part1_switch") 
part2_switch = m.addVar(vtype=GRB.BINARY, name="part2_switch") 
part3_switch = m.addVar(vtype=GRB.BINARY, name="part3_switch") 
part4_switch = m.addVar(vtype=GRB.BINARY, name="part4_switch") 
gas = gload - (pp2g + pp2g_delta) * 0.83 + gchp1 + gchp2 
power = pload - ppv - pwt + pp2g + hload / (0.95 * 0.95) + pess_delta 
# 目标函数 
part1 = -gbuy * (gload - (pp2g + pp2g_delta) * 0.83) * part1_switch 
part2 = gsold * (gload - (pp2g + pp2g_delta) * 0.83) * part2_switch 
part3 = -pbuy * (pload - pwt + pp2g + hload / (0.95 * 0.95) + pess_delta) * part3_switch 
part4 = psold * (pload - pwt + pp2g + hload / (0.95 * 0.95) + pess_delta) * part4_switch 

#Q1:I want to use the absolute value of this variable in the formula, but I get an error

TypeError: unsupported operand type(s) for *: 'float' and 'GenExpr' 

part6 = -0.01 * abs_(pess_delta) 
part5 = -0.01 * abs_(pp2g + pp2g_delta) 
# 设置目标函数为各个部分的线性组合 
m.setObjective(part1 + part2 + part3 + part4 + part5 + part6, GRB.MAXIMIZE) 
# 约束 m.addConstr(pp2g + pp2g_delta >= 0, "c4") 
m.addConstr(pp2g + pp2g_delta<= 150, "c5") 
m.addConstr(pess + pess_delta >= -1000, "c6") 
m.addConstr(pess + pess_delta <= 1000, "c7") 
m.addConstr(hess >= -800, "c8") 
m.addConstr(pp2g_delta <= 60, "c12") 
m.addConstr(pp2g_delta >= 0, "c13") 

# Q2:The logic here goes like this:

there are 2 variables in “gas” and “power” - “pp2g_delta” and “pess_delta”.

if gas >= 0: r1 = -gbuy * gas else: r1 = gsold * gas 
if power >= 0: r2 = -pbuy * power else: r2 = psold * power

 But the program runs and tells me that this is wrong, and an error is reported

——gurobipy.GurobiError: Constraint has no bool value (are you trying "lb <= expr <= ub"?) 

So, I want to use the 0/1 variable to circumvent the problem, means:

r1= part1 * 1 + part2 * 0 another part1 * 0 + part2 * 1 r2= part3 * 1 + part4 * 0 another part3 * 0 + part2 * 4 

but there is still an error

——gurobipy.GurobiError: Constraint has no bool value (are you trying "lb <= expr <= ub"?) 

m.addConstr(part1_switch == gurobipy.LinExpr(1 if gas >= 0 else 0), name="part1_switch_constraint") 
m.addConstr(part2_switch == gurobipy.LinExpr(1 if gas < 0 else 0), name="part2_switch_constraint") 
m.addConstr(part3_switch == gurobipy.LinExpr(1 if power >= 0 else 0), name="part3_switch_constraint") 
m.addConstr(part4_switch == gurobipy.LinExpr(1 if power < 0 else 0), name="part4_switch_constraint") 
m.optimize() for v in m.getVars(): print('%s %g' % (v.varName, v.x)) print('Obj: %g' % m.objVal)